GENERAL DIAGNOSTIC TABLE
Engine (Diagnostics)
15. General Diagnostic Table
S068257
A
S068257A10
NOTE:
  Malfunction of parts other than those listed is also possible.
  The right-hand priority column indicates the inspection priority of probable causes of the symptom. Carry out the check starting from A.
Symptom
Problem parts
Priority
1. Engine does not start. (internal combustion does
1) ECM power supply
A
not occur.)
2) Engine ground terminal
A
3) Crankshaft position sensor
?
4) Fuel pump
?
5) Pressure regulator
?
6) Engine coolant temperature sensor
?
7) Ignition coil & ignitor
?
8) Spark plug
?
9) Fuel injector
?
10) Idle air control solenoid valve
?
2. Engine does not start. (internal combustion
1) ECM power supply
?
occurs.)
2) Spark plug
?
3) Engine coolant temperature sensor
?
4) Pressure regulator
?
5) Pressure sensor
?
6) Fuel pump
?
7) Fuel injector
?
8) Idle air control solenoid valve
?
3. Engine does not start. (engine stalls after inter-
1) ECM power supply
?
nal combustion.)
2) Pressure sensor
?
3) Engine coolant temperature sensor
?
4) Spark plug
?
5) Ignition coil
?
6) Fuel pump
?
7) Pressure regulator
?
8) Fuel injector
?
9) Idle air control solenoid valve
?
4. Engine stalls.
1) Pressure sensor
?
2) Spark plug
?
3) Accelerator cable is out of adjustment
?
4) ECM power supply
?
5) Throttle position sensor
?
6) Crankshaft position sensor
?
7) Vehicle speed sensor
?
8) Ignition coil
?
9) Fuel pump
?
10) Idle air control solenoid valve
?
5. Rough idling
1) Spark plug
?
2) Pressure sensor
?
3) Engine coolant temperature sensor
?
4) Pressure regulator
?
5) Idle air control solenoid valve
?
6) Air leak in air intake system
?
7) ECM power supply
?
8) Throttle position sensor
?
9) Intake air temperature sensor
?
10) Oxygen sensor
?
11) Fuel pump
?
12) Fuel injector
?
13) Test mode or read memory connectors are con-
?
nected.
EN(SOHCw/oOBD)-113
GENERAL DIAGNOSTIC TABLE
Engine (Diagnostics)
Symptom
Problem parts
Priority
6. Hard to drive at constant speed
1) Pressure regulator 2) Fuel injector 3) Pressure sensor 4) Engine coolant temperature sensor 5) Throttle position sensor 6) Fuel pump
? ? ? ? ?? >
7. Poor acceleration/deceleration
1) Spark plug 2) Throttle position sensor 3) Ignition coil 4) Fuel pump 5) Pressure regulator 6) Fuel injector 7) Pressure sensor 8) Engine coolant temperature sensor 9) Idle air control solenoid valve 10) Knock sensor
? ? ? ? ? ? ? ? ? ?
8. Poor return to idling
1) Accelerator cable is out of adjustment 2) Throttle position sensor 3) Idle air control solenoid valve 4) Pressure sensor 5) Engine coolant temperature sensor
? ? ?? ?? >
9. Backfire
1) Spark plug 2) Fuel injector 3) Ignition coil and ignitor 4) Fuel pump 5) Pressure regulator
? ? ? ?? >
10. Knocking
1) Fuel pump 2) Pressure regulator 3) Engine coolant temperature sensor 4) Knock sensor
? ? ?? ??
11. Excessive fuel consumption
1) Engine coolant temperature sensor 2) Pressure sensor 3) Intake air temperature sensor 4) Pressure regulator
?? ?? ?? >
12. Shocks while driving
1) Pressure regulator 2) ECM power supply 3) Throttle position sensor
?? ?? >
13. Poor engine revving
1) Pressure regulator 2) Pressure sensor 3) Engine coolant temperature sensor 4) Throttle sensor 5) Intake air temperature sensor 6) Fuel pump
?? ?? ?? ?? ?? >
14. Remarks
1) ECM power supply 2) Pressure sensor 3) Pressure regulator 4) Idle air control solenoid valve 5) Air leak in air intake system
A*
B*
B* B* B*
A*: Including ECM ground circuit B*: Check hoses.
EN(SOHCw/oOBD)-114