TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the A/C-Heater Control Switch harness connector.
Start the engine.
Is the A/C Compressor off?
All
Yes
→ Replace the A/C-Heater Control Switch.
Perform ROAD TEST VERIFICATION - VER-2.
No
→ Go To 5
5
Turn the ignition off.
Disconnect the A/C Low Pressure Switch harness connector.
Disconnect the A/C - Heater Control Switch harness connector.
Measure the resistance between ground and the A/C Request Signal circuit.
Is the resistance above 100 kohms?
All
Yes
→ Go To 6
No
→ Repair the A/C Request Signal circuit for a short to ground.
Perform ROAD TEST VERIFICATION - VER-2.
6
Turn the ignition off.
Disconnect the A/C Low Pressure Switch harness connector.
Start the engine.
Is the A/C Compressor off?
All
Yes
→ Replace the A/C Low Pressure Switch.
Perform ROAD TEST VERIFICATION - VER-2.
No
→ Go To 7
7
Turn the ignition off.
Disconnect the A/C Low Pressure Switch harness connector.
Disconnect the A/C High Pressure Switch harness connector.
Measure the resistance between ground and the A/C Low Pressure Signal circuit.
Is the resistance above 100 kohms?
All
Yes
→ Go To 8
No
→ Repair the A/C Low Pressure Signal circuit for a short to ground.
Perform ROAD TEST VERIFICATION - VER-2.
8
Turn the ignition off.
Disconnect the A/C High Pressure Switch harness connector.
Start the engine.
Is the A/C Compressor off?
All
Yes
→ Replace the A/C High Pressure Switch.
Perform ROAD TEST VERIFICATION - VER-2.
No
→ Go To 9
9
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the A/C High Pressure Switch harness connector.
Measure the resistance between ground and the A/C High Pressure Signal circuit.
Is the resistance above 1000 ohms?
All
Yes
→ Go To 10
No
→ Repair the A/C High Pressure Signal circuit for a short to ground.
Perform ROAD TEST VERIFICATION - VER-2.
216
DRIVEABILITY - DIESEL
*A/C OPERATES IN ALL MODE SWITCH POSITIONS —
Continued