Symptom:
P0594-SPEED CONTROL SERVO POWER CIRCUIT
When Monitored and Set Condition:
P0594-SPEED CONTROL SERVO POWER CIRCUIT
When Monitored: With the ignition key on. The speed control switched on.
Set Condition: The PCM detects a open or short in the Speed Control Power Supply
circuit. One Trip Fault.
POSSIBLE CAUSES
(V40) S/C BRAKE SWITCH OUTPUT CIRCUIT
(V32) S/C POWER SUPPLY CIRCUIT
(V32) S/C POWER SUPPLY CIRCUIT SHORTED TO GROUND
(V40) S/C BRAKE SWITCH OUTPUT CIRCUIT SHORTEDTO GROUND
(V40) S/C BRAKE SWITCH OUTPUT CIRCUIT OPEN
BRAKE LAMP SWITCH
PCM (S/C SOURCE CIRCUIT)
TEST ACTION APPLICABILITY
1 Turn the ignition off.
Disconnect the Speed Control Servo harness connector.
Ignition on, engine not running.
NOTE: It is necessary to PRESS and HOLD the Speed Control Switch in the
ON position while checking for voltage.
Using a 12-volt test light connected to ground, probe the (V40) S/C Brake Switch
Output terminal in the Servo Harness connector.
Does the test light illuminate brightly?
All
Yes → Refer to the INTERMITTENT CONDITION symptom in the
Driveability category.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
No → Go To 2
222
DRIVEABILITY - NGC
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