EDI DIAGNOSIS
SERVICE MANUAL NUMBER 22
90-860074--1 FEBRUARY 2002 Page 5E-51
TEST DESCRIPTION
NOTE: The relay terminal numbers can be found on the bottom of the relay.
Verify continuity between the following:
ECM 68 PIN CONNECTOR
GLOW PLUG RELAY CONNECTOR /
TERMINAL NUMBER
50 85
Verify continuity between the following:
ECM 68 PIN CONNECTOR
INSTRUMENT PANEL TERMINAL
3 BLK/YEL Wire at glow plug indicator lamp
on the Engine Monitor Panel
Verify supply voltage from circuit breakers to relays with relay connector unplugged and key
ON. Measure:
CURRENT (VOLTS) GLOW PLUG RELAY CONNECTOR
NUMBER
12 30
12 86
DIAGNOSTIC HELP:
Verify the following:
• Open or short in the CKT Pin 50, or CKT Pins 1.
• Improper terminals or pins at the electrical box, relay connector or ECM.
• Defective circuit breaker.
• Defective Relay.
• Defective ECM.
Failure of a Glow Plug Relay influences engine performance as follows:
• Difficult or no starting.
• May have white smoke on start up.
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