529-554
NOTEKOEO refers to Key On Engine Off (KOEO)
KOER refers to Key On Engine Running (KOER)
DTC refers to Diagnostic Trouble Code (DTC)
DTCs should be diagnosed in the order they are received.
DTC 529
Data Communication Link or Powertrain Control Module circuit failure.
KOEO Memory Code Go to ML25
ML25 - Continuous Code 529, "Check Engine"/"Check DCL"
DTC 532
Cluster Control Assembly circuit failure.
KOEO Memory Code Go to ML25
ML25 - Continuous Code 529, "Check Engine"/"Check DCL"
DTC 533
Data Communication Link or Electronic Instrument Cluster circuit failure.
KOEO Memory Code Go to ML25
ML25 - Continuous Code 529, "Check Engine"/"Check DCL"
DTC 536
Brake On/Off circuit failure or not actuated during KOER self-test.
KOER Hard Code Go to FD1
FD1 - Verify Brake Was Pressed
KOEO Memory Code Go to FD90
FD90 - Check For Proper Stoplamp Switch Installation
DTC 538
- Insufficient RPM change during KOER dynamic response test.
- Invalid cylinder balance test due to throttle movement during test.
- Invalid cylinder balance test due to cylinder identification circuit failure.
KOER Hard Code Go to M1
M1 - System Failed to Recognize Brief WOT
DTC 539
A/C or defrost "ON" during Self-Test.
KOEO Hard Code Go to KM40
KM40 - Check A/C Input
KOER Hard Code Go to KM40
KM40 - Check A/C Input
DTC 542
Fuel pump secondary circuit failure.
KOEO Hard Code Go to X80
X80 - Code 542: Does Engine Start
KOEO Memory Code Go to X105
X80 - Code 542: Does Engine Start
DTC 543
Fuel pump secondary circuit failure.
KOEO Hard Code Go to X90
X90 - Does Engine Start
KOEO Memory Code Go to X110
X110 - Check for DTC 556/557
DTC 551
Idle Air Control circuit failure during KOEO self-test.
KOEO Hard Code Go to KT1
DTC 552
Secondary Air Injection Bypass circuit failure during KOEO self-test.
KOEO Hard Code Go to KC9
KC9 - Check Voltage of VPWR Circuit
DTC 553
Secondary Air Injection Diverter circuit failure during KOEO self-test.
KOEO Hard Code Go to KC9
KC9 - Check Voltage of VPWR Circuit
DTC 554
Fuel Pressure Regulator Control circuit failure.
KOEO Hard Code Go to KN1
KN1 - KOEO Service Code 554: Enter Output State Check