4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
6E–217
DIAGNOSTIC TROUBLE CODE (DTC) P0380 (SYMPTOM CODE 4) (FLASH CODE 66) GLOW RELAY CIRCUIT VOLTAGE LOW DIAGNOSTIC TROUBLE CODE (DTC) P0380 (SYMPTOM CODE 8) (FLASH CODE 66) GLOW RELAY CIRCUIT VOLTAGE HIGH
Condition for setting the DTC and action taken when the DTC sets Flash Code
Code
Symptom Code
MIL
DTC Name
DTC Setting Condition
66
P0380
4
ON
Glow Relay Circuit Voltage Low
Glow relay circuit open or short to ground circuit.
8
ON
Glow Relay Circuit Voltage High
Glow relay circuit short to voltage circuit.
Fail-Safe (Back Up) No fail-safe function.
Circuit Description
Diagnostic Aids
The voltage on the coil of the relay glow plug is supplied by the relay engine control module (ECM) main. The ECM switches glow relay to operate glow plug depends on the coolant temperature. In the after glow phase the lamp is not illuminated but the glow plugs remain active for a certain period depending on engine coolant temperature.
An intermittent may be caused by the following: • Poor connections. • Misrouted harness. • Rubbed through wire insulation. • Broken wire inside the insulation. Check for the following conditions: