Troubleshooting
Troubleshooting Guide
NOTE: Across each row in the chart, the systems that could be sources of a symptom are ranked in the order they should
be inspected starting with . Find the symptom in the left column, read across to the most likely source, then refer
to the page listed at the top of that column. If inspection shows the system is OK, try the next most likely system , etc.
If codes other than those listed above are indicated, count the number of blinks again. If the Malfunction Indicator
Lamp is in fact blinking these codes, substitute a known-good ECM and recheck. If the indication goes away, replace
the original ECM.
If the Malfunction Indicator Lamp is on while the engine is running, jump the service check connector. If no code
is displayed (Malfunction Indicator Lamp stays on steady), the back-up system is in operation.
Substitute a known-good ECM and recheck. If the indication goes away, replace the original ECM.
USA:
Malfunction
Indicator
Lamp (MIL)
CANADA:
Check
Engine
Light
PAGE SYSTEM
SYMTOM
MALFUNCTION
INDICATOR LAMP”
TURNS ON
MALFUNCTION
INDICATOR LAMP BLINKS
ENGINE WON’T START
DIFFICULT TO START
ENGINE WHEN COLD
WHEN COLD
FAST IDLE
OUT OF SPEC
IRREGULAR
IDLING
ROUGH IDLE
WHEN WARM
RPM
TOO HIGH
WHEN WARM
RPM
TOO LOW
WHILE
WARMING UP
FREQUENT
STALLING
AFTER
WARMING UP
MISFIRE OR
ROUGH
RUNNING
POOR
PERFORM-
ANCE
FAILS
EMISSION
TEST
LOSS OF
POWER
ENGINE
CONTROL
MODULE
11-42
HEATED
OXYGEN
SENSOR
11-48, 11-50
MANIFOLD
ABSOLUTE
PRESSURE
SENSOR
11-58
CRANKSHAFT
POSITION/
CYLINDER
POSITION
SENSOR
11-64
PGM-FI
ENGINE
COOLANT
TEMPERA-
TURE
SENSOR
THROTTLE
POSITION
SENSOR
INTAKE AIR
TEMPERA-
TURE
SENSOR
BAROMET-
RIC PRES-
SURE
SENSOR
IGNITION
OUTPUT
SIGNAL
VARIABLE VALVE
TIMING & VALVE
LIFT ELECTRONIC
CONTROL SOLENOID
VALVE
6-1511-7411-7211-7011-6811-66
Troubleshooting Guide
NOTE: Across each row in the chart, the systems that could be sources of a symptom are ranked in the order they should
be inspected starting with . Find the symptom in the left column, read across to the most likely source, then refer
to the page listed at the top of that column. If inspection shows the system is OK, try the next most likely system , etc.
If codes other than those listed above are indicated, count the number of blinks again. If the Malfunction Indicator
Lamp is in fact blinking these codes, substitute a known-good ECM and recheck. If the indication goes away, replace
the original ECM.
If the Malfunction Indicator Lamp is on while the engine is running, jump the service check connector. If no code
is displayed (Malfunction Indicator Lamp stays on steady), the back-up system is in operation.
Substitute a known-good ECM and recheck. If the indication goes away, replace the original ECM.
USA:
Malfunction
Indicator
Lamp (MIL)
CANADA:
Check
Engine
Light
PAGE SYSTEM
SYMTOM
MALFUNCTION
INDICATOR LAMP”
TURNS ON
MALFUNCTION
INDICATOR LAMP BLINKS
ENGINE WON’T START
DIFFICULT TO START
ENGINE WHEN COLD
WHEN COLD
FAST IDLE
OUT OF SPEC
IRREGULAR
IDLING
ROUGH IDLE
WHEN WARM
RPM
TOO HIGH
WHEN WARM
RPM
TOO LOW
WHILE
WARMING UP
FREQUENT
STALLING
AFTER
WARMING UP
MISFIRE OR
ROUGH
RUNNING
POOR
PERFORM-
ANCE
FAILS
EMISSION
TEST
LOSS OF
POWER
ENGINE
CONTROL
MODULE
11-42
HEATED
OXYGEN
SENSOR
11-48, 11-50
MANIFOLD
ABSOLUTE
PRESSURE
SENSOR
11-58
CRANKSHAFT
POSITION/
CYLINDER
POSITION
SENSOR
11-64
PGM-FI
ENGINE
COOLANT
TEMPERA-
TURE
SENSOR
THROTTLE
POSITION
SENSOR
INTAKE AIR
TEMPERA-
TURE
SENSOR
BAROMET-
RIC PRES-
SURE
SENSOR
IGNITION
OUTPUT
SIGNAL
VARIABLE VALVE
TIMING & VALVE
LIFT ELECTRONIC
CONTROL SOLENOID
VALVE
6-1511-7411-7211-7011-6811-66
PGM-FI
VARIABLE VALVE
TIMING & VALVE
LIFT ELECTRONIC
CONTROL PRES-
SURE SWITCH
VEHICLE
SPEED
SENSOR
IGNITION
TIMING
ADJUSTER
KNOCK
SENSOR
A/T FI
SIGNAL A
A/T Fl
SIGNAL B
IDLE AIR
CONTROL
VALVE
OTHER
IDLE
CONTROLS
FUEL
INJECTOR
FUEL
METERING
OTHER
FUEL
SUPPLY
INTAKE
AIR
EXHAUST
GAS
RECIRCU-
LATION
CONTROL
SYSTEM
EMISSION CONTROL
OTHER
EMISSION
CONT-
ROLS
11-14111-14511-12711-10411-11611-54,11-5611-10711-8411-8811-8211-8211-8011-7811-766-17(’91-’93)
IDLE CONTROL FUEL SUPPLY
FUEL
PUMP