1997 PCED OBDII-Diesel
SECTION 5C: Pinpoint Tests

W: Injector Driver Module Enable (IDM-EN)
  W: Introduction  

 

W1 DIAGNOSTIC TROUBLE CODE (DTC) P1662

Is battery voltage present?
YesNo
GO to W2.REPAIR open in Circuit 361 (W/LB). RESTORE vehicle. CLEAR DTCs and RETEST.
 

W2 CHECK FOR SHORT TO GROUND

Is resistance greater than 10,000 ohms?
YesNo
GO to W4.GO to W3.
 

W3 CHECK FOR SHORT TO GROUND ON CIRCUIT 814 (W/BK)

Is resistance greater than 10,000 ohms?
YesNo
REPLACE the PCM. RESTORE vehicle. CLEAR DTCs and RETEST.REPAIR short to ground on Circuit 814 (W/BK). RESTORE vehicle. CLEAR DTCs and RETEST.
 

W4 VERIFY THAT THE PCM IS ENABLING THE RELAY

Does resistance reading drop below 5 ohms?
YesNo
REPLACE the IDM relay. RESTORE vehicle. CLEAR DTCs and RETEST.GO to W5.
 

W5 CHECK CONTINUITY ON CIRCUIT 814 (W/BK)

Is resistance less than 5 ohms?
YesNo
REPLACE the PCM. RESTORE vehicle. CLEAR DTCs and RETEST.REPAIR open in Circuit 814 (W/BK). RESTORE vehicle. CLEAR DTCs and RETEST.
 

W6 DTC P1663 AND P1667 SET TOGETHER WITH OR WITHOUT P1668, CHECK FOR DTC P1662

Was DTC P1662 present?
YesNo
GO to W1.GO to W7.
 

W7 CHECK MAXI FUSE

Is battery voltage present on both sides of the fuse?
YesNo
GO to W8.REPLACE short to ground on Circuit 876 (DG/LG) and REPLACE MAXI fuse. RESTORE vehicle. CLEAR DTCs and RETEST.
 

W8 CHECK CIRCUIT 37 (Y)

Is resistance less than 5 ohms?
YesNo
GO to W9.REPAIR open on Circuit 37 (Y). RESTORE vehicle. CLEAR DTCs and RETEST.
 

W9 CHECK CONTINUITY ON CIRCUIT 876 (DG/LG)

Is resistance less than 5 ohms?
YesNo
GO to W10.REPAIR open on Circuit 876 (DG/LG). RESTORE vehicle. CLEAR DTCs and RETEST.
 

W10 IDM RELAY CHECK

Is resistance less than 5 ohms?
YesNo
GO to W11.REPLACE IDM relay. RESTORE vehicle. CLEAR DTCs and RETEST.
 

W11 IDM GROUND CHECK

Is resistance less than 5 ohms?
YesNo
REPLACE IDM. RESTORE vehicle. CLEAR DTCs and RETEST.REPAIR open in IDM ground Circuit 571 (BK/PK). RESTORE vehicle. CLEAR DTCs and RETEST.