Auxiliary Heater (ZHZ)

901C-FLAME SENSOR CIRCUIT PERFORMANCE (ZHZ)

For a complete wiring diagram, Refer to the Wiring Information Electrical Diagrams.

- When Monitored:
Continuously.

- Set Condition:
The Warm Water Auxiliary Heating 2 Control Unit detects the Flame Sensor is defective.





1. DTC IS ACTIVE
1. Turn the ignition on.
2. With the scan tool, read DTCs.

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 the BODY VERIFICATION TEST. Verification Tests.

2. FLAME SENSOR
1. Read the specified value of the Flame Sensor at a temperature of 20 degrees Celsius.

Does the specified value read 1062 kOhms at a temperature of 20 degrees Celsius?

Yes

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

No

- Replace the Flame Sensor.
- Perform the BODY VERIFICATION TEST. Verification Tests.