Circulation Pump Circuit Low (ZHZ)

9020-CIRCULATION PUMP CIRCUIT LOW (ZHZ)

For a complete wiring diagram Consult Diagrams/Electrical.

- When Monitored:
Continuously.

- Set Condition:
The Warm Water Auxiliary Heating 2 Control Unit detects a short to ground.





Diagnostic Test

1. DTC IS ACTIVE
Turn the ignition on.
With the scan tool, read DTC's.
Is this DTC active?

Yes

- Go To 2

No

- The condition that caused this symptom is currently not present. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals. Repair as necessary.
- Perform BODY VERIFICATION TEST - VER 1. Verification Tests.

2. CIRCULATION PUMP
Turn the ignition off.
Disconnect the Circulation Pump harness connector.
Turn the ignition on.
With the scan tool, read DTC's.
Is this DTC active?

Yes

- Go To 3

No

- Replace the Circulation Pump.
- Perform BODY VERIFICATION TEST - VER 1.Verification Tests

3. CHECK FOR CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the Warm Water Auxiliary Heating 2 Control Unit harness connector.
Measure the resistance between ground and the related circuits.
Does the ohm meter read open circuit?

Yes

- Replace the Warm Water Auxiliary Heating 2 Control Unit.
- Perform BODY VERIFICATION TEST - VER 1.Verification Tests

No

- Repair the circuit shorted to ground.
- Perform BODY VERIFICATION TEST - VER 1.Verification Tests