DIAGNOSTICS FOR ENGINE STARTING FAILURE
Engine (Diagnostics)
12. Diagnostics for Engine Starting Failure
S068533
A: PROCEDURE
S068533E45
1. Inspection of starter motor circuit. <Ref. to EN(SOHCw/oOBD)-48 STARTER MOTOR CIRCUIT, Diagnostics for Engine Starting Failure.>
2. Inspection of ECM power supply and ground line. <Ref. to EN(SOHCw/oOBD)-52 CONTROL MODULE POWER SUPPLY AND GROUND LINE, Diagnostics for Engine Starting Failure. >
3. Inspection of ignition control system. <Ref. to EN(SOHCw/oOBD)-54 IGNITION CONTROL SYSTEM, Diagnostics for Engine Starting Failure.>
4. Inspection of fuel pump circuit. <Ref. to EN(SOHCw/oOBD)-58 FUEL PUMP CIRCUIT, Diagnostics for Engine Starting Failure.>
5. Inspection of fuel injector circuit. <Ref. to EN(SOHCw/oOBD)-62 FUEL INJECTOR CIRCUIT, Diagnostics for Engine Start­ing Failure.>
EN(SOHCw/oOBD)-47
DIAGNOSTICS FOR ENGINE STARTING FAILURE
Engine (Diagnostics)
B: STARTER MOTOR CIRCUIT
S068533E94
CAUTION:
After repair or replacement of faulty parts, conduct CLEAR MEMORY and INSPECTION MODES. <Ref. to EN(SOHCw/oOBD)-31 OPERATION, Clear Memory Mode.> and <Ref. to EN(SOHCw/ oOBD)-29 OPERATION, Inspection Mode.>
• WIRING DIAGRAM:
for_01_21-368.jpg
EN(SOHCw/oOBD)-48
DIAGNOSTICS FOR ENGINE STARTING FAILURE
Engine (Diagnostics)
No.
Step
Check
Yes
No
1
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 select lever in the "P" or "N" position.
Is the voltage more than 10 V?
Go to step 2.
Go to step 3.
2
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-8, INSPECTION, Starter.>
Repair open cir­cuit of ground cable.
3
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 4.
4
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 5.
NOTE: Check the follow­ing and repair if necessary. • Blown out fuse (SBF-1, SBF-4) • If replaced fuse (SBF-1, SBF-4) blows easily, check the harness for short circuit of harness between fuse and ignition switch connector. • Open circuit in harness between ignition switch and battery
5
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 6.
Replace ignition switch.
6
CHECK TRANSMISSION TYPE.
Is the vehicle AT?
Go to step 7.
Repair open cir­cuit between igni­tion switch and starter motor cir­cuit.
EN(SOHCw/oOBD)-49
DIAGNOSTICS FOR ENGINE STARTING FAILURE
Engine (Diagnostics)
No.
Step
Check
Yes
No
7
CHECK INHIBITOR SWITCH CIRCUIT.
Is the resistance less than
Repair open cir-
Go to step 8.
1) Turn ignition switch to OFF.
1 Q?
cuit in harness
2) Place the select 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:
8
CHECK TRANSMISSION HARNESS.
Is the resistance less than
Go to step 9.
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:
(T3) No. 12 - (T7) No. 12:
9
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(SOHCw/oOBD)-50
DIAGNOSTICS FOR ENGINE STARTING FAILURE
Engine (Diagnostics) MEMO:
EN(SOHCw/oOBD)-51
DIAGNOSTICS FOR ENGINE STARTING FAILURE
Engine (Diagnostics)
C: CONTROL MODULE POWER SUPPLY AND GROUND LINE
S068533E37
CAUTION:
After repair or replacement of faulty parts, conduct CLEAR MEMORY and INSPECTION MODES. <Ref. to EN(SOHCw/oOBD)-31 OPERATION, Clear Memory Mode.> and <Ref. to EN(SOHCw/ oOBD)-29 OPERATION, Inspection Mode.>
• WIRING DIAGRAM:
for_01_21-369.jpg
No.
Step
Check
Yes
No
1
CHECK MAIN RELAY.
Is the resistance less than
Go to step 2.
Replace main
1) Turn 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:
EN(SOHCw/oOBD)-52
DIAGNOSTICS FOR ENGINE STARTING FAILURE
Engine (Diagnostics)
No.
Step
Check
Yes
No
2
CHECK MAIN RELAY.
Measure resistance between main relay termi­nals. Terminals No. 4 - No. 6:
Is the resistance less than 10 Q?
Go to step 3.
Replace main relay.
3
CHECK GROUND CIRCUIT OF ECM. 1) Disconnect connectors from ECM. 2) Measure resistance of harness between ECM and engine ground. Connector & terminal (E22) No. 10 - Engine ground: (E22) No. 11 - Engine ground: (E22) No. 12 - Engine ground: (E22) No. 21 - Engine ground:
Is the resistance less than 5Q?
Go to step 4.
Repair open cir­cuit in harness between ECM connector and engine grounding terminal.
4
CHECK INPUT VOLTAGE OF ECM.
1) Turn ignition switch to ON. 2) Measure voltage between ECM connector and engine ground. Connector & terminal (B84) No. 28 (+) - Engine ground (-):
Is the voltage more than 10 V?
Go to step 5.
Repair open or ground short cir­cuit of power sup­ply circuit.
5
CHECK INPUT VOLTAGE OF MAIN RELAY. Measure voltage between main relay connec­tor and chassis ground. Connector & terminal (B47) No. 1 (+) - Chassis ground (-): (B47) No. 5 (+) - Chassis ground (-): (B47) No. 6 (+) - Chassis ground (-):
Is the voltage more than 10 V?
Go to step 6.
Repair open or ground short cir­cuit of power sup­ply circuit.
6
CHECK INPUT VOLTAGE OF ECM.
Measure voltage between ECM connector and engine ground. Connector & terminal (B84) No. 34 (+) - Engine ground (-):
Is the voltage more than 10 V?
Go to step 7.
Repair open or ground short cir­cuit of power sup­ply circuit.
7
CHECK INPUT VOLTAGE OF ECM.
1) Turn ignition switch to OFF. 2) Connect main relay connector. 3) Measure voltage between ECM connector and engine ground. Connector & terminal (B84) No. 5 (+) - Engine ground (-):
Is the voltage more than 10 V?
Go to step 8.
Repair open or ground short cir­cuit between ECM connector and main relay con­nector.
8
CHECK INPUT VOLTAGE OF ECM.
1) Connect ST. <Ref. to EN(SOHCw/oOBD)-23, HOW TO CHECK I/O SIGNAL FOR ECM, Engine Control Module (ECM) I/O Signal.> ST 498307600 CHECK BOARD KIT 2) Measure voltage between ECM connector and engine ground. Connector & terminal (B) No. 27 (+) - Engine ground (-): (C) No. 36 (+) - Engine ground (-):
Is the voltage more than 10 V?
Check ignition control system. <Ref. to EN(SOHCw/ oOBD)-54, IGNI­TION CONTROL SYSTEM, Diag­nostics for Engine Starting Failure.>
Repair open or ground short cir­cuit between ECM connector and main relay con­nector.
EN(SOHCw/oOBD)-53
DIAGNOSTICS FOR ENGINE STARTING FAILURE
Engine (Diagnostics)
D: IGNITION CONTROL SYSTEM
S068533E95
CAUTION:
After repair or replacement of faulty parts, conduct CLEAR MEMORY and INSPECTION MODES. <Ref. to EN(SOHCw/oOBD)-31 OPERATION, Clear Memory Mode.> and <Ref. to EN(SOHCw/ oOBD)-29 OPERATION, Inspection Mode.>
• WIRING DIAGRAM:
for_01_21-370.jpg
EN(SOHCw/oOBD)-54
DIAGNOSTICS FOR ENGINE STARTING FAILURE
Engine (Diagnostics)
No.
Step
Check
Yes
No
1
CHECK IGNITION SYSTEM FOR SPARKS.
1) Remove plug cord cap from each spark plug. 2) Install new spark plug on plug cord cap. CAUTION: Do not remove spark plug from engine. 3) Contact spark plug's thread portion on engine. 4) While opening throttle valve fully, crank engine to check that spark occurs at each cylinder.
Does spark occur at each cylinder?
Check fuel pump system. <Ref. to EN(SOHCw/ oOBD)-58, FUEL PUMP CIRCUIT, Diagnostics for Engine Starting Failure.>
Go to step 2.
2
CHECK POWER SUPPLY CIRCUIT FOR IGNITION COIL & IGNITOR ASSEMBLY.
1) Turn ignition switch to OFF. 2) Disconnect connector from ignition coil & ignitor assembly. 3) Turn ignition switch to ON. 4) Measure power supply 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 3.
Repair harness and connector. NOTE: In this case, repair the follow­ing: • Open circuit in harness between ignition coil & igni­tor assembly, and ignition switch connector • Poor contact in coupling connec­tor (B20)
3
CHECK HARNESS OF IGNITION COIL & IGNITOR ASSEMBLY GROUND CIRCUIT.
1) Turn ignition switch to OFF. 2) Measure resistance between ignition coil & ignitor assembly connector and engine ground. Connector & terminal (E12) No. 3 - Engine ground:
Is the resistance between less than 5 Q?
Go to step 4.
Repair harness and connector. NOTE: In this case, repair the follow­ing: • Open circuit in harness between ignition coil & igni­tor assembly con­nector and engine grounding termi­nal
4
CHECK IGNITION COIL & IGNITOR ASSEM­BLY.
1) Remove spark plug cords. 2) Measure resistance between spark plug cord contact portions to check secondary coil. Terminals No. 1 - No. 2: No. 3 - No. 4:
Is the resistance between 10 and 15 Q?
Go to step 5.
Replace ignition coil & ignitor assembly. <Ref. to IG(SOHCw/ oOBD)-9, Ignition Coil and Ignitor Assembly. >
5
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. 2 (+) - Engine ground (-): (E12) No. 4 (+) - Engine ground (-):
Is the voltage more than 10 V?
Go to step 6.
Replace ignition coil & ignitor assembly.
EN(SOHCw/oOBD)-55
DIAGNOSTICS FOR ENGINE STARTING FAILURE
Engine (Diagnostics)
No.
Step
Check
Yes
No
6
CHECK HARNESS BETWEEN ECM AND IGNITION COIL & IGNITOR ASSEMBLY CONNECTOR.
1) Disconnect connector from ECM. 2) Measure resistance of harness between ECM and ignition coil & ignitor assembly con­nector. Connector & terminal (E22) No. 9 - (E12) No. 4: (E22) No. 3 - (E12) No. 2: (E22) No. 10 - (E12) No. 3:
Is the resistance less than 1 Q?
Go to step 7.
Repair open cir­cuit in harness between ECM and ignition coil & ignitor assembly connector.
7
CHECK HARNESS BETWEEN ECM AND IGNITION COIL & IGNITOR ASSEMBLY CONNECTOR. Measure resistance of harness between ECM and engine ground. Connector & terminal: (E22) No. 3 - Engine ground: (E22) No. 9 - Engine ground:
Is the resistance more than 1 MQ?
Go to step 8.
Repair ground short circuit in harness between ECM and ignition coil & ignitor assembly 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 pump circuit. <Ref. to EN(SOHCw/ oOBD)-58, FUEL PUMP CIRCUIT, Diagnostics for Engine Starting Failure.>
EN(SOHCw/oOBD)-56
DIAGNOSTICS FOR ENGINE STARTING FAILURE
Engine (Diagnostics) MEMO:
EN(SOHCw/oOBD)-57
DIAGNOSTICS FOR ENGINE STARTING FAILURE
Engine (Diagnostics)
E: FUEL PUMP CIRCUIT
S068533E96
CAUTION:
After repair or replacement of faulty parts, conduct CLEAR MEMORY and INSPECTION MODES.
<Ref. to EN(SOHCw/oOBD)-31 OPERATION, Clear Memory Mode.> and <Ref. to EN(SOHCw/
oOBD)-29 OPERATION, Inspection Mode.>
• WIRING DIAGRAM:
for_01_21-371.jpg
EN(SOHCw/oOBD)-58
DIAGNOSTICS FOR ENGINE STARTING FAILURE
Engine (Diagnostics)
No.
Step
Check
Yes
No
1
CHECK OPERATING SOUND OF FUEL PUMP.
1) Connect test mode connector. 2) Turn ignition switch to ON. 3) Make sure that fuel pump is in operation. NOTE: For the procedure, refer to the "COMPUL­SORY VALVE OPERATION CHECK MODE". <Ref. to EN(SOHCw/oOBD)-32, Compulsory Valve Operation Check Mode.>
Does fuel pump produce operating sound?
Check fuel injec­tor circuit. <Ref. to EN(SOHCw/ oOBD)-62, 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 luggage compartment floor. 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(SOHCw/ oOBD)-50, 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 between fuel pump and fuel pump relay connector. 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 and fuel pump relay connector • 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 ground short circuit in harness between fuel pump and fuel pump relay connector.
EN(SOHCw/oOBD)-59
DIAGNOSTICS FOR ENGINE STARTING FAILURE
Engine (Diagnostics)
No.
Step
Check
Yes
No
6
CHECK FUEL PUMP RELAY.
1) Disconnect connector from fuel pump relay. 2) Remove fuel pump relay from 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(SOHCw/ oOBD)-40, 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 (B84) No. 3 - (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(SOHCw/ oOBD)-62, FUEL INJECTOR CIRCUIT, Diag­nostics for Engine Starting Failure.>
EN(SOHCw/oOBD)-60
DIAGNOSTICS FOR ENGINE STARTING FAILURE
Engine (Diagnostics) MEMO:
EN(SOHCw/oOBD)-61
DIAGNOSTICS FOR ENGINE STARTING FAILURE
Engine (Diagnostics)
F: FUEL INJECTOR CIRCUIT
S068533E97
CAUTION:
•  Check or repair only faulty parts.
•  After repair or replacement of faulty parts, conduct CLEAR MEMORY and INSPECTION MODES. <Ref. to EN(SOHCw/oOBD)-31 OPERATION, Clear Memory Mode.> and <Ref. to EN(SOHCw/ oOBD)-29 OPERATION, Inspection Mode.>
•  WIRING DIAGRAM:
for_01_21-372.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
Fuel Pressure.>
sound scope or attach a screwdriver to injec-
tor for this check.
EN(SOHCw/oOBD)-62
DIAGNOSTICS FOR ENGINE STARTING FAILURE
Engine (Diagnostics)
No.
Step
Check
Yes
No
2
CHECK POWER SUPPLY TO EACH FUEL INJECTOR.
1) Turn ignition switch to OFF. 2) Disconnect connector from fuel injector. 3) Turn ignition switch to ON. 4) Measure power supply voltage between the fuel injector terminal and engine ground. Connector & terminal #1 (E5) No. 2 (+) - Engine ground (-): #2 (E16) No. 2 (+) - Engine ground
#3 (E6) No. 2 (+) - Engine ground (-): #4 (E17) No. 2 (+) - Engine ground
Is the voltage more than 10 V?
Go to step 3.
Repair harness and connector. NOTE: In this case, repair the follow­ing: • Open circuit in harness between main relay and fuel injector con­nector • Poor contact in main relay con­nector • Poor contact in coupling connec­tor (B20) • Poor contact in fuel injector con­nector
3
CHECK EACH FUEL INJECTOR.
1) Turn ignition switch to OFF. 2) Measure resistance between each fuel injector terminals. Terminals No. 1 - No. 2:
Is the resistance between 11 and 12 Q?
Go to step 4.
Replace faulty fuel injector. <Ref. to FU(SOHCw/ oOBD)-32, Fuel Injector.>
4
CHECK HARNESS BETWEEN ECM AND FUEL INJECTOR CONNECTOR.
1) Disconnect connector from ECM. 2) Measure resistance of harness between ECM and fuel injector connector. Connector & terminal (E22) No. 7-#1 (E5) No. 1: (E22) No. 7-#2 (E16) No. 1: (E22) No.6-#3 (E6) No. 1: (E22) No. 6- #4 (E17) No. 1:
Is the resistance less than 1 Q?
Go to step 5.
Repair open cir­cuit in harness between ECM and fuel injector connector.
5
CHECK HARNESS BETWEEN ECM AND FUEL INJECTOR CONNECTOR.
Measure resistance of harness between ECM and fuel injector connector. Connector & terminal (E22) No. 6 - Engine ground: (E22) No. 7 - Engine ground:
Is the resistance more than 1 MQ?
Go to step 6.
Repair ground short in harness between ECM and fuel injector connector.
6
CHECK POOR CONTACT.
Check poor contact in ECM connector.
Is there poor contact in ECM connector?
Repair poor con­tact in ECM con­nector.
Check crankshaft position sensor circuit. <Ref. to EN(SOHCw/ oOBD)-64, CRANKSHAFT POSITION SEN­SOR CIRCUIT, Diagnostics for Engine Starting Failure.>
EN(SOHCw/oOBD)-63
DIAGNOSTICS FOR ENGINE STARTING FAILURE
Engine (Diagnostics)
G: CRANKSHAFT POSITION SENSOR CIRCUIT
S068533E98
CAUTION:
After repair or replacement of faulty parts, conduct CLEAR MEMORY and INSPECTION MODES.
<Ref. to EN(SOHCw/oOBD)-31, Clear Memory Mode.>, <Ref. to EN(SOHCw/oOBD)-29, Inspection
Mode.>
NOTE:
Check crankshaft position sensor circuit. <Ref. to EN(SOHCw/oOBD)-68, DTC 11 CRANKSHAFT POSI­TION SENSOR, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
EN(SOHCw/oOBD)-64