2002 PCED OBDII-Diesel
SECTION 5: Pinpoint Tests
DM: Engine Coolant Temperature (ECT) Sensor — Manual Transmission Only
DM1 KOEO DIAGNOSTIC TROUBLE CODE P0117
Is DTC P0118 present?
Yes
INSTALL a new ECT sensor. RESTORE vehicle. CLEAR DTCs and RETEST.
No
GO to DM2 .
DM2 CHECK ECT SIGNAL CIRCUIT FOR SHORT TO GND
Is the resistance greater than 10,000 ohms?
Yes
INSTALL a new PCM. RESTORE vehicle. CLEAR DTCs and RETEST.
No
REPAIR short to ground in ECT signal circuit. RESTORE vehicle. CLEAR DTCs and RETEST. INSTALL a new PCM.
DM3 KOEO DIAGNOSTIC TROUBLE CODE P0118
Is the resistance less than 5 ohms?
Yes
GO to DM4 .
No
REPAIR open in signal return circuit to ECT sensor. RESTORE vehicle. CLEAR DTCs and RETEST.
DM4 INDUCE OPPOSITE FAILURE
Is DTC P0117 present?
Yes
INSTALL a new ECT sensor. RESTORE vehicle. CLEAR DTCs and RETEST.
No
GO to DM5 .
DM5 CHECK ECT SIGNAL CIRCUIT FOR SHORT TO POWER
Is each resistance greater than 10,000 ohms?
Yes
INSTALL a new PCM. RESTORE vehicle. CLEAR DTCs and RETEST.
No
REPAIR short to PWR or VREF in ECT signal circuit. RESTORE vehicle. CLEAR DTCs and RETEST.
DM6 CHECK SIGNAL RETURN
Is the resistance less than 5 ohms?
Yes
GO to DM7 .
No
REPAIR open in signal return circuit 359 (GY/RD). RESTORE vehicle. CLEAR DTCs and RETEST.
DM7 ECT SIGNAL CONTINUITY CHECK
Is the resistance less than 5 ohms?
Yes
GO to DM8 .
No
REPAIR open ECT signal circuit 923 (OG/BK). RESTORE vehicle. CLEAR DTCs and RETEST.
DM8 CONTINUOUS MEMORY CODE P0117
Is DTC P0117 present?
DM9 INTERMITTENT CIRCUIT FAILURE CHECK — DTC P0117
Is P0117 present?
Yes
REPAIR intermittent circuit failure. RESTORE vehicle. CLEAR DTCs and retest.
No
GO to DM10 .
DM10 INTERMITTENT ECT SENSOR CHECK
Is DTC P0117 present?
Yes
INSTALL a new ECT sensor. VISUALLY inspect ECT harness connector for damaged pins. RESTORE vehicle. CLEAR DTCs and RETEST.
No
Unable to duplicate or identify concern at this time. RESTORE vehicle. CLEAR DTCs.
DM11 CONTINUOUS MEMORY CODE P0118
Is DTC P0118 present?
DM12 INTERMITTENT CIRCUIT FAILURE CHECK — DTC P0118
Is DTC P0118 present?
Yes
REPAIR intermittent circuit failure. RESTORE vehicle. CLEAR DTCs and RETEST.
No
GO to DM13 .
DM13 INTERMITTENT ECT SENSOR CHECK
Is DTC P0118 present?
Yes
INSTALL a new ECT sensor. Visually INSPECT ECT harness connector for damaged pins. RESTORE vehicle. CLEAR DTCs and RETEST.
No
Unable to duplicate or identify concern at this time. RESTORE vehicle. CLEAR DTCs.