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DRIVEABILITY - DIESEL
Symptom List:
P1643-VISCOUS HEATER RELAY OPEN CIRCUIT
P1643-VISCOUS HEATER RELAY SHORT CIRCUIT
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P1643-VISCOUS HEATER RELAY
OPEN CIRCUIT.
When Monitored and Set Condition:
P1643-VISCOUS HEATER RELAY OPEN CIRCUIT
When Monitored: With the ignition on.
Set Condition: The ECM does not detect voltage on the Viscous Heater Relay Control
circuit.
P1643-VISCOUS HEATER RELAY SHORT CIRCUIT
When Monitored: With the ignition on.
Set Condition: The ECM detects excessive current on the Viscous Heater Relay Control
circuit.
INTERMITTENT CONDITION
ASD RELAY OUTPUT CIRCUIT OPEN
SUBSTITUTE VISCOUS HEATER RELAY
VISCOUS HEATER RELAY CONTROL CIRCUIT SHORTED TO VOLTAGE
VISCOUS HEATER RELAY CONTROL CIRCUIT SHORTED TO GROUND
VAISCOUS HEATER RELAY CONTROL CIRCUIT OPEN
ENGINE CONTROL MODULE
TEST
1
Turn the ignition on.
With the DRBIII , actuate the Viscous Heater Relay.
Is the Viscous Heater Relay clicking?
Yes → Go To 2
→ Go To 3
No
POSSIBLE CAUSES
ACTION
194
APPLICABILITY
All
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