DIAGNOSTICS FOR ENGINE STARTING FAILURE
Engine (Diagnostics)
16. Diagnostics for Engine Starting Failure
S058533
A: PROCEDURE
S058533E45
1. Inspection of starter motor circuit. <Ref. to EN(SOHC)-60, STARTER MOTOR CIRCUIT, Diagnostics for Engine Starting Failure.>
2. Inspection of ECM power supply and ground line. <Ref. to EN(SOHC)-64, CONTROL MODULE POWER SUPPLY AND GROUND LINE, Diagnostics for Engine Starting Failure.>
3. Inspection of ignition control system. <Ref. to EN(SOHC)-68, IGNITION CONTROL SYSTEM, Diagnostics for Engine Starting Failure.>
4. Inspection of fuel pump circuit. <Ref. to EN(SOHC)-72, FUEL PUMP CIRCUIT, Diagnostics for Engine Starting Failure.>
5. Inspection of fuel injector circuit. <Ref. to EN(SOHC)-76, FUEL INJECTOR CIRCUIT, Diagnostics for Engine Starting Fail­ure.>
EN(SOHC)-59
DIAGNOSTICS FOR ENGINE STARTING FAILURE
Engine (Diagnostics)
B: STARTER MOTOR CIRCUIT
S058533E94
CAUTION:
After repair or replacement of faulty parts, conduct CLEAR MEMORY MODE <Ref. to EN(SOHC)-45,
Clear Memory Mode.> and INSPECTION MODE <Ref. to EN(SOHC)-42, Inspection Mode.>.
- WIRING DIAGRAM:
for_01_20-86.jpg
EN(SOHC)-60
DIAGNOSTICS FOR ENGINE STARTING FAILURE
Engine (Diagnostics)
No.
Step
Check
Yes
No
1
CHECK OPERATION OF STARTER MOTOR.
Does starter motor operate when the switch starts?
Go to step 2.
Go to step 3.
2
CHECK DTC.
<Ref. to EN(SOHC)-41, OPERATION, Read Diagnostic Trouble Code.>
Is the trouble code stored in memory? <Ref. to EN(SOHC)-80, LIST, List of Diagnostic Trouble Code (DTC).>
Record DTC. Repair the trouble case. <Ref. to EN(SOHC)-86, Engine Control Module (ECM) I/O Signal.>
Go to step 3.
3
CHECK INPUT SIGNAL FOR STARTER MOTOR.
1) Turn ignition switch to OFF. 2) Disconnect connector from starter motor. 3) Turn ignition switch to ST. 4) Measure power supply voltage between starter motor connector terminal and engine ground. Connector & terminal (B14) No. 1 (+) - Engine ground (-): NOTE: On AT vehicles, place the selector lever in the "P" or "N" position.
Is the voltage more than 10 V?
Go to step 4.
Go to step 5.
4
CHECK GROUND CIRCUIT OF STARTER MOTOR.
1) Turn ignition switch to OFF. 2) Disconnect terminal from starter motor. 3) Measure resistance of ground cable between ground cable terminal and engine ground.
Is resistance less than 5 Q?
Check starter motor. <Ref. to SC-5, Starter.>
Repair open cir­cuit of ground cable.
5
CHECK HARNESS BETWEEN ECM AND STARTER MOTOR CIRCUIT.
1) Turn ignition switch to OFF. 2) Measure resistance between starter motor and ECM. Connector & terminal (B14) No. 1 - Engine ground:
Is resistance less than 1 Q?
Repair ground short circuit.
Go to step 6.
6
CHECK HARNESS BETWEEN ECM AND STARTER MOTOR CIRCUIT.
1) Turn ignition switch to START. 2) Measure resistance of fuse. Connector & terminal (B14) No. 1 - Engine ground:
Is resistance less than 1 Q?
Go to step 7.
Repair ground short circuit.
7
CHECK HARNESS BETWEEN BATTERY AND IGNITION SWITCH CONNECTOR.
1) Ignition switch to OFF. 2) Disconnect connector from ignition switch. 3) Measure power supply voltage between ignition switch connector and chassis ground. Connector & terminal (B72) No. 1 (+) - Chassis ground (-):
Is the voltage more than 10 V?
Go to step 8.
Repair open cir­cuit in harness between ignition switch and bat­tery.
8
CHECK HARNESS BETWEEN BATTERY AND IGNITION SWITCH CONNECTOR.
1) Connect connector to ignition switch. 2) Turn ignition switch to START. 3) Measure voltage between ignition switch and chassis ground. Connector & terminal (B72) No. 3 (+) - Chassis ground (-):
Is the voltage more than 10 V?
Go to step 9.
Replace ignition switch.
EN(SOHC)-61
DIAGNOSTICS FOR ENGINE STARTING FAILURE
Engine (Diagnostics)
No.
Step
Check
Yes
No
9
CHECK TRANSMISSION TYPE.
Is the vehicle AT?
Go to step 10.
Repair open cir-
cuit between igni-
tion switch and
starter motor cir-
cuit.
10
CHECK INHIBITOR SWITCH CIRCUIT.
Is the resistance less than
Repair open cir-
Go to step 11.
1) Turn ignition switch to OFF.
1 Q?
cuit in harness
2) Place the selector lever in the "P" or "N"
between starter
position.
motor and ignition
3) Separate transmission harness connector.
switch connector.
4) Measure resistance between transmission
harness connector receptacle's terminals.
Connector & terminal
(T3) No. 11 - No. 12:
11
CHECK TRANSMISSION HARNESS.
Is the resistance less than
Go to step 12.
Repair open cir-
1) Disconnect connector from inhibitor switch.
1 Q?
cuit in harness
2) Measure resistance of harness between
between transmis-
transmission harness and inhibitor switch con-
sion harness and
nector.
inhibitor switch
Connector & terminal
connector.
(T3) No. 11 - (T7) No. 7:
12
CHECK POOR CONTACT.
Is there poor contact in
Repair poor con-
Replace inhibitor
Check poor contact in inhibitor switch connect
inhibitor switch connector?
tact in inhibitor
switch.
tor.
switch connector.
EN(SOHC)-62
DIAGNOSTICS FOR ENGINE STARTING FAILURE
Engine (Diagnostics) MEMO:
EN(SOHC)-63
DIAGNOSTICS FOR ENGINE STARTING FAILURE
Engine (Diagnostics)
C: CONTROL MODULE POWER SUPPLY AND GROUND LINE
S058533E37
CAUTION:
After repair or replacement of faulty parts, conduct CLEAR MEMORY MODE <Ref. to EN(SOHC)-45,
Clear Memory Mode.> and INSPECTION MODE. <Ref. to EN(SOHC)-42, Inspection Mode.>
- WIRING DIAGRAM:
for_01_20-87.jpg
No.
Step
Check
Yes
No
1
CHECK MAIN RELAY.
Is the resistance less than
Go to step 2.
Replace main
1) Turn the ignition switch to OFF.
10 Q?
relay.
2) Remove main relay.
3) Connect battery to main relay terminals No.
1 and No. 2.
4) Measure resistance between main relay
terminals.
Terminals
No. 3 - No. 5:
No. 4 - No. 6:
EN(SOHC)-64
DIAGNOSTICS FOR ENGINE STARTING FAILURE
Engine (Diagnostics)
No.
Step
Check
Yes
No
2
CHECK GROUND CIRCUIT OF ECM. 1) Disconnect connector from ECM. 2) Measure resistance of harness between ECM and chassis ground. Connector & terminal (B136) No. 21 - Chassis ground: (B136) No. 22 - Chassis ground: (B134) No. 27 - Chassis ground: (B134) No. 8 - Chassis ground: (B134) No. 7 - Chassis ground: (B134) No. 34 - Chassis ground: (B134) No. 35 - Chassis ground:
Is the resistance less than 5Q?
Go to step 3.
Repair open cir­cuit in harness between ECM connector and engine grounding terminal.
3
CHECK INPUT VOLTAGE OF ECM.
Measure voltage between ECM connector and chassis ground. Connector & terminal (B136) No. 9 (+) - Chassis ground (-):
Is the voltage more than 10 V?
Go to step 4.
Repair open or ground short cir­cuit of power sup­ply circuit.
4
CHECK INPUT VOLTAGE OF ECM.
1) Turn ignition switch to ON. 2) Measure voltage between ECM connector and chassis ground. Connector & terminal (B135) No. 7 (+) - Chassis ground (-):
Is the voltage more than 10 V?
Go to step 5.
Repair open or ground short cir­cuit of power sup­ply circuit.
5
CHECK HARNESS BETWEEN ECM AND MAIN RELAY CONNECTOR.
1) Turn ignition switch to OFF. 2) Measure resistance between ECM and chassis ground. Connector & terminal (B135) No. 19 - Chassis ground:
Is the resistance more than 1 MQ?
Go to step 6.
Repair ground short circuit in harness between ECM connector and main relay connector, then replace ECM.
6
CHECK OUTPUT VOLTAGE FROM ECM.
1) Connect connector to ECM. 2) Turn ignition switch to ON. 3) Measure voltage between ECM connector and chassis ground. Connector & terminal (B135) No. 19 (+) - Chassis ground
Is the voltage more than 10 V?
Go to step 7.
Replace ECM.
7
CHECK INPUT VOLTAGE OF MAIN RELAY.
Check voltage between main relay connector and chassis ground. Connector & terminal (B47) No. 2 (+) - Chassis ground (-):
Is the voltage more than 10 V?
Go to step 8.
Repair open cir­cuit in harness between ECM connector and main relay con­nector.
8
CHECK GROUND CIRCUIT OF MAIN RELAY.
1) Turn ignition switch to OFF. 2) Measure resistance between main relay connector and chassis ground. Connector & terminal (B47) No. 1 - Chassis ground:
Is the resistance less than 5Q?
Go to step 9.
Repair open cir­cuit between main relay and chassis ground.
9
CHECK INPUT VOLTAGE OF MAIN RELAY.
Measure voltage between main relay connec­tor and chassis ground. Connector & terminal (B47) No. 5 (+) - Chassis ground (-): (B47) No. 6 (+) - Chassis ground (-):
Is the voltage more than 10 V?
Go to step 10.
Repair open or ground short cir­cuit in harness of power supply cir­cuit.
EN(SOHC)-65
DIAGNOSTICS FOR ENGINE STARTING FAILURE
Engine (Diagnostics)
No.
Step
Check
Yes
No
10
CHECK INPUT VOLTAGE OF ECM.
Is the voltage more than 10
Check ignition
Repair open or
1) Connect main relay connector.
V?
control system.
ground short cir-
2) Turn ignition switch to ON.
<Ref. to
cuit in harness
3) Measure voltage between ECM connector
EN(SOHC)-68,
between ECM
and chassis ground.
IGNITION CON-
connector and
Connector & terminal
TROL SYSTEM,
main relay con-
(B136) No. 1 (+) - Chassis ground (-):
Diagnostics for
nector.
(B136) No. 2 (+) - Chassis ground (-):
Engine Starting
Failure.>
EN(SOHC)-66
DIAGNOSTICS FOR ENGINE STARTING FAILURE
Engine (Diagnostics) MEMO:
EN(SOHC)-67
DIAGNOSTICS FOR ENGINE STARTING FAILURE
Engine (Diagnostics)
D: IGNITION CONTROL SYSTEM
S058533E95
CAUTION:
After repair or replacement of faulty parts, conduct CLEAR MEMORY MODE <Ref. to EN(SOHC)-45,
Clear Memory Mode.> and INSPECTION MODE <Ref. to EN(SOHC)-42, Inspection Mode.>.
- WIRING DIAGRAM:
for_01_20-88.jpg
EN(SOHC)-68
DIAGNOSTICS FOR ENGINE STARTING FAILURE
Engine (Diagnostics)
No.
Step
Check
Yes
No
1
CHECK IGNITION SYSTEM FOR SPARKS.
Does spark occur at each
Check fuel pump
Go to step 2.
1) Remove plug cord cap from each spark
cylinder?
system. <Ref. to
plug.
EN(SOHC)-72,
2) Install new spark plug on plug cord cap.
FUEL PUMP
CAUTION:
CIRCUIT, Diag-
Do not remove spark plug from engine.
nostics for Engine
3) Contact spark plug's thread portion on
Starting Failure.>
engine.
4) While opening throttle valve fully, crank
engine to check that spark occurs at each
cylinder.
2
CHECK POWER SUPPLY CIRCUIT FOR
Is the voltage more than 10
Go to step 3.
Repair harness
IGNITION COIL & IGNITOR ASSEMBLY.
V?
and connector.
1) Turn ignition switch to OFF.
NOTE:
2) Disconnect connector from ignition coil &
In this case,
ignitor assembly.
repair the follow-
3) Turn ignition switch to ON.
ing:
4) Measure power supply voltage between
- Open circuit in
ignition coil & ignitor assembly connector and
harness between
engine ground.
ignition coil & igni-
Connector & terminal
tor assembly, and
(E12) No. 2 (+) - Engine ground (-):
ignition switch
connector
- Poor contact in
coupling connec-
tors (B22)
3
CHECK HARNESS OF IGNITION COIL &
Is the resistance between
Go to step 4.
Repair harness
IGNITOR ASSEMBLY GROUND CIRCUIT.
less than 5 Q?
and connector.
1) Turn ignition switch to OFF.
NOTE:
2) Measure resistance between ignition coil &
In this case,
ignitor assembly connector and engine
repair the follow-
ground.
ing:
Connector & terminal
- Open circuit in
(E12) No. 3 - Engine ground:
harness between
ignition coil & igni-
tor assembly con-
nector and engine
grounding termi-
nal
4
CHECK IGNITION COIL & IGNITOR ASSEM-
Is the resistance between
Go to step 5.
Replace ignition
BLY.
10 and 15 –®?
coil & ignitor
1) Remove spark plug cords.
assembly. <Ref.
2) Measure resistance between spark plug
to IG(SOHC)-8,
cord contact portions to check secondary coil.
Ignition Coil and
Terminals
Ignitor Assembly.>
No. 1 - No. 2:
5
CHECK IGNITION COIL & IGNITOR ASSEM-
Is the resistance between
Go to step 6.
Replace ignition
BLY.
10 and 15 –®?
coil & ignitor
Measure resistance between spark plug cord
assembly. <Ref.
contact portions to check secondary coil.
to IG(SOHC)-8,
Terminals
Ignition Coil and
No. 3 - No. 4:
Ignitor Assembly.>
EN(SOHC)-69
DIAGNOSTICS FOR ENGINE STARTING FAILURE
Engine (Diagnostics)
No.
Step
Check
Yes
No
6
CHECK INPUT SIGNAL FOR IGNITION COIL & IGNITOR ASSEMBLY.
1) Connect connector to ignition coil & ignitor assembly. 2) Check if voltage varies synchronously with engine speed when cranking, while monitoring voltage between ignition coil & ignitor assem­bly connector and engine ground. Connector & terminal (E12) No. 1 (+) - Engine ground (-):
Is the voltage more than 10 V?
Go to step 7.
Replace ignition coil & ignitor assembly. <Ref. to IG(SOHC)-8, Ignition Coil and Ignitor Assembly.>
7
CHECK INPUT SIGNAL FOR IGNITION COIL & IGNITOR ASSEMBLY.
Check if voltage varies synchronously with engine speed when cranking, while monitoring voltage between ignition coil & ignitor assem­bly connector and engine ground. Connector & terminal (E12) No. 4 (+) - Engine ground (-):
Is the voltage more than 10 V?
Go to step 8.
Replace ignition coil & ignitor assembly. <Ref. to IG(SOHC)-8, Ignition Coil and Ignitor Assembly.>
8
CHECK HARNESS BETWEEN ECM AND IGNITION COIL & IGNITOR ASSEMBLY CONNECTOR.
1) Turn ignition switch to OFF. 2) Disconnect connector from ECM. 3) Disconnect connector from ignition coil & ignitor assembly. 4) Measure resistance of harness between ECM and ignition coil & ignitor assembly con­nector. Connector & terminal (B134) No. 25 - (E12) No. 1:
Is the resistance less than 1 Q?
Go to step 9.
Repair harness and connector. NOTE: In this case, repair the follow­ing: - Open circuit in harness between ECM and ignition coil & ignitor assembly connec­tor - Poor contact in coupling connec­tor (B22)
9
CHECK HARNESS BETWEEN ECM AND IGNITION COIL & IGNITOR ASSEMBLY CONNECTOR.
Measure resistance of harness between ECM and ignition coil & ignitor assembly connector. Connector & terminal (B134) No. 26 - (E12) No. 4:
Is the resistance less than 1 Q?
Go to step 10.
Repair harness and connector. NOTE: In this case, repair the follow­ing: - Open circuit in harness between ECM and ignition coil & ignitor assembly connec­tor - Poor contact in coupling connec­tor (B22)
10
CHECK HARNESS BETWEEN ECM AND IGNITION COIL & IGNITOR ASSEMBLY CONNECTOR.
Measure resistance of harness between ECM and engine ground. Connector & terminal: (B134) No. 25 - Engine ground:
Is the resistance more than 1 MQ?
Go to step 11.
Repair ground short circuit in harness between ECM and ignition coil & ignitor assembly connec­tor.
EN(SOHC)-70
DIAGNOSTICS FOR ENGINE STARTING FAILURE
Engine (Diagnostics)
No.
Step
Check
Yes
No
11
CHECK HARNESS BETWEEN ECM AND
Is the resistance more than
Go to step 12.
Repair ground
IGNITION COIL & IGNITOR ASSEMBLY
1 MQ?
short circuit in
CONNECTOR.
harness between
Measure resistance of harness between ECM
ECM and ignition
and engine ground.
coil & ignitor
Connector & terminal
assembly connec-
(B134) No. 26 - Engine ground:
tor.
12
CHECK POOR CONTACT.
Is there poor contact in
Repair poor con-
Check fuel pump
Check poor contact in ECM connector.
ECM connector?
tact in ECM con-
circuit. <Ref. to
nector.
EN(SOHC)-72,
FUEL PUMP
CIRCUIT, Diag-
nostics for Engine
Starting Failure.>
EN(SOHC)-71
DIAGNOSTICS FOR ENGINE STARTING FAILURE
Engine (Diagnostics)
E: FUEL PUMP CIRCUIT
S058533E96
CAUTION:
After repair or replacement of faulty parts, conduct CLEAR MEMORY MODE <Ref. to EN(SOHC)-45,
Clear Memory Mode.> and INSPECTION MODE <Ref. to EN(SOHC)-42, Inspection Mode.>.
- WIRING DIAGRAM:
for_01_20-89.jpg
EN(SOHC)-72
DIAGNOSTICS FOR ENGINE STARTING FAILURE
Engine (Diagnostics)
No.
Step
Check
Yes
No
1
CHECK OPERATING SOUND OF FUEL PUMP.
Make sure that fuel pump is in operation for two seconds when turning ignition switch to ON. NOTE: Fuel pump operation can also be executed using Subaru Select Monitor (Function mode: FD01). For the procedure, refer to "Compulsory Valve Operation Check Mode". <Ref. to EN(SOHC)-46, Compulsory Valve Operation Check Mode.>
Does fuel pump produce operating sound?
Check fuel injec­tor circuit. <Ref. to EN(SOHC)-76, FUEL INJECTOR CIRCUIT, Diag­nostics for Engine Starting Failure.>
Go to step 2.
2
CHECK GROUND CIRCUIT OF FUEL PUMP.
1) Turn ignition switch to OFF. 2) Remove fuel pump access hole lid located on the right rear of trunk compartment floor (Sedan) or luggage compartment floor (Wagon). 3) Disconnect connector from fuel pump. 4) Measure resistance of harness connector between fuel pump and chassis ground. Connector & terminal (R58) No. 4 - Chassis ground:
Is the resistance less than 5Q?
Go to step 3.
Repair harness and connector. NOTE: In this case, repair the follow­ing: - Open circuit in harness between fuel pump con­nector and chas­sis grounding ter­minal - Poor contact in coupling connec­tor (R15)
3
CHECK POWER SUPPLY TO FUEL PUMP.
1) Turn ignition switch to ON. 2) Measure voltage of power supply circuit between fuel pump connector and chassis ground. Connector & terminal (R58) No. 1 (+) - Chassis ground (-):
Is the voltage more than 10 V?
Replace fuel pump. <Ref. to FU(SOHC)-62, Fuel Pump.>
Go to step 4.
4
CHECK HARNESS BETWEEN FUEL PUMP AND FUEL PUMP RELAY CONNECTOR.
1) Turn ignition switch to OFF. 2) Measure resistance of harness connector between fuel pump and fuel pump relay. Connector & terminal (R58) No. 1 - (B46) No. 4:
Is the resistance less than 1 Q?
Go to step 5.
Repair harness and connector. NOTE: In this case, repair the follow­ing: - Open circuit in harness between fuel pump con­nector and chas­sis grounding ter­minal - Poor contact in coupling connec­tors R15 and B97
5
CHECK HARNESS BETWEEN FUEL PUMP AND FUEL PUMP RELAY CONNECTOR.
Measure resistance of harness between fuel pump and fuel pump relay connector. Connector & terminal (R58) No. 1 - Chassis ground:
Is the resistance more than 1 MQ?
Go to step 6.
Repair short cir­cuit in harness between fuel pump and fuel pump relay con­nector.
EN(SOHC)-73
DIAGNOSTICS FOR ENGINE STARTING FAILURE
Engine (Diagnostics)
No.
Step
Check
Yes
No
6
CHECK FUEL PUMP RELAY.
1) Disconnect connectors from fuel pump relay and main relay. 2) Remove fuel pump relay and main relay with bracket. 3) Connect battery to fuel pump relay connec­tor terminals No. 1 and No. 3. 4) Measure resistance between connector terminals of fuel pump relay. Terminals No. 2 - No. 4:
Is the resistance less than 10 Q?
Go to step 7.
Replace fuel pump relay. <Ref. to FU(SOHC)-51, Fuel Pump Relay. >
7
CHECK HARNESS BETWEEN ECM AND FUEL PUMP RELAY CONNECTOR.
1) Disconnect connectors from ECM. 2) Measure resistance of harness between ECM and fuel pump relay connector. Connector & terminal (B134) No. 29 - (B46) No. 3:
Is the resistance less than 1 Q?
Go to step 8.
Repair open cir­cuit in harness between ECM and fuel pump relay connector.
8
CHECK POOR CONTACT.
Check poor contact in ECM connector.
Is there poor contact in ECM connector?
Repair poor con­tact in ECM con­nector.
Check fuel injec­tor circuit. <Ref. to EN(SOHC)-76, FUEL INJECTOR CIRCUIT, Diag­nostics for Engine Starting Failure.>
EN(SOHC)-74
DIAGNOSTICS FOR ENGINE STARTING FAILURE
Engine (Diagnostics) MEMO:
EN(SOHC)-75
DIAGNOSTICS FOR ENGINE STARTING FAILURE
Engine (Diagnostics)
F: FUEL INJECTOR CIRCUIT
S058533E97
CAUTION:
Check or repair only faulty parts.
-  After repair or replacement of faulty parts, conduct CLEAR MEMORY MODE <Ref. to EN(SOHC)-45, Clear Memory Mode.> and INSPECTION MODE. <Ref. to EN(SOHC)-42, Inspection Mode.>
-  WIRING DIAGRAM:
for_01_20-90.jpg
No.
Step
Check
Yes
No
1
CHECK OPERATION OF EACH FUEL
Is the fuel injector emits
Check fuel pres-
Go to step 2.
INJECTOR.
"operating" sound?
sure. <Ref. to
While cranking the engine, check that each
ME(SOHC)-28,
fuel injector emits "operating" sound. Use a
INSPECTION,
sound scope or attach a screwdriver to injec-
Fuel Pressure.>
tor for this check.
EN(SOHC)-76
DIAGNOSTICS FOR ENGINE STARTING FAILURE
Engine (Diagnostics)
No.
Step
Check
Yes
No
2
CHECK POWER SUPPLY TO EACH FUEL
Is the voltage more than 10
Go to step 3.
Repair harness
INJECTOR.
V?
and connector.
1) Turn ignition switch to OFF.
NOTE:
2) Disconnect connector from #1 cylinder fuel
In this case,
injector.
repair the follow-
3) Turn ignition switch to ON.
ing:
4) Measure power supply voltage between the
- Open circuit in
fuel injector terminal and engine ground.
harness between
Connector & terminal
main relay and
#1 (E5) No. 2 (+) - Engine ground (-):
fuel injector con-
#2 (E16) No. 2 (+) - Engine ground
nector
- Poor contact in
#3 (E6) No. 2 (+) - Engine ground (-):
main relay con-
#4 (E17) No. 2 (+) - Engine ground
nector
- Poor contact in
coupling connec-
tor (B22)
- Poor contact in
fuel injector con-
nector
3
CHECK HARNESS BETWEEN ECM AND
Is the resistance between 5
Go to step 4.
Repair harness
FUEL INJECTOR CONNECTOR.
and 20 Q?
and connector.
1) Disconnect connector from ECM.
NOTE:
2) Measure resistance of harness between
In this case,
ECM and fuel injector connector.
repair the follow-
Connector & terminal
ing:
(B134) No. 4 - (B136) No. 2:
- Open circuit in
harness between
ECM and fuel
injector connector
- Poor contact in
coupling connec-
tor (B22)
4
CHECK HARNESS BETWEEN ECM AND
Is the resistance less than
Repair ground
Go to step 5.
FUEL INJECTOR CONNECTOR.
1 Q?
short circuit in
Measure resistance of harness between ECM
harness between
and fuel injector connector.
ECM and fuel
Connector & terminal
injector connector.
(B134) No. 4 - Chassis ground:
5
CHECK HARNESS BETWEEN ECM AND
Is the resistance between 5
Go to step 6.
Repair harness
FUEL INJECTOR CONNECTOR.
and 20 Q?
and connector.
Measure resistance of harness between ECM
NOTE:
and fuel injector connector.
In this case,
Connector & terminal
repair the follow-
(B134) No. 13 - (B136) No. 2:
ing:
- Open circuit in
harness between
ECM and fuel
injector connector
- Poor contact in
coupling connec-
tor (B22)
6
CHECK HARNESS BETWEEN ECM AND
Is the resistance less than
Repair ground
Go to step 7.
FUEL INJECTOR CONNECTOR.
1 Q?
short circuit in
Measure resistance of harness between ECM
harness between
and fuel injector connector.
ECM and fuel
Connector & terminal
injector connector.
(B134) No. 13 - Chassis ground:
EN(SOHC)-77
DIAGNOSTICS FOR ENGINE STARTING FAILURE
Engine (Diagnostics)
No.
Step
Check
Yes
No
7
CHECK HARNESS BETWEEN ECM AND
Is the resistance between 5
Go to step 8.
Repair harness
FUEL INJECTOR CONNECTOR.
and 20 Q?
and connector.
Measure resistance of harness between ECM
NOTE:
and fuel injector connector.
In this case,
Connector & terminal
repair the follow-
(B134) No. 14 - (B136) No. 2:
ing:
- Open circuit in
harness between
ECM and fuel
injector connector
- Poor contact in
coupling connec-
tor (B22)
8
CHECK HARNESS BETWEEN ECM AND
Is the resistance less than
Repair ground
Go to step 9.
FUEL INJECTOR CONNECTOR.
1 Q?
short circuit in
Measure resistance of harness between ECM
harness between
and fuel injector connector.
ECM and fuel
Connector & terminal
injector connector.
(B134) No. 14 - Chassis ground:
9
CHECK HARNESS BETWEEN ECM AND
Is the resistance between 5
Go to step 10.
Repair harness
FUEL INJECTOR CONNECTOR.
and 20 Q?
and connector.
Measure resistance of harness between ECM
NOTE:
and fuel injector connector.
In this case,
Connector & terminal
repair the follow-
(B134) No. 15 - (B136) No. 2:
ing:
- Open circuit in
harness between
ECM and fuel
injector connector
- Poor contact in
coupling connec-
tor (B22)
10
CHECK HARNESS BETWEEN ECM AND
Is the resistance less than
Repair ground
Go to step 11.
FUEL INJECTOR CONNECTOR.
1 Q?
short circuit in
Measure resistance of harness between ECM
harness between
and fuel injector connector.
ECM and fuel
Connector & terminal
injector connector.
(B134) No. 15 - Chassis ground:
11
CHECK EACH FUEL INJECTOR.
Is the resistance between 5
Go to step 12.
Replace faulty
1) Turn ignition switch to OFF.
and 20 Q?
fuel injector.
2) Measure resistance between each fuel
injector terminals.
Terminals
No. 1 - No. 2:
12
CHECK POOR CONTACT.
Is there poor contact in
Repair poor con-
Inspection using
Check poor contact in ECM connector.
ECM connector?
tact in ECM con-
"General Diagnos-
nector.
tic Table". <Ref. to
EN(SOHC)-294,
INSPECTION,
Genera Diagnos-
tic Table.>
EN(SOHC)-78
DIAGNOSTICS FOR ENGINE STARTING FAILURE
Engine (Diagnostics) MEMO:
EN(SOHC)-79