PROHEAT M-SERIES SERVICE MANUAL
3-29
FLAME FAULT Diagnostic Code
Indicates that:
1. The PROHEAT reached 185°F (85°C) cycled off and entered Cool Down.
After 20 seconds a flame was still detected.
2. The PROHEAT was switched on and a flame (signal) was detected in
Pre-check.
Troubleshoot the Flame Fault diagnostic code based on:
1. Fuel System fault. Go to pages 3-6 to 3-15, Steps 3 to 7.
2. PCM Flame Sensor circuit. Go to page 3-20.
TEMPERATURE SENSOR T1 Diagnostic Code
Indicates an electrical fault in the Temperature Sensor.
Troubleshoot the Temperature Sensor diagnostic code based on:
Whether the PROHEAT is equipped with a single Temperature Sensor or dual
Temperature Sensors.
Temperature Sensor and PCM (single sensor) – Check:
a) Temperature Sensor and PCM electrical function.
Test Procedure – Sensor and PCM:
a) Remove Temperature Sensor connector from PCM connection T1.
b) Remove the PCM sealing plug from PCM connection T2. Put sealing plug
into PCM connection T1.
c) Reconnect the Temperature Sensor connector to PCM connection T2.
d) Switch the PROHEAT on:
If a diagnostic code is indicated, the sensor is faulty. Go to Temperature
Sensor replacement.
If after changing the Temperature
Sensor a diagnostic code is still
indicated, the PCM is faulty. Go to PCM
replacement, page 3-39.
If a diagnostic code is not indicated, the
PCM T1 circuit is faulty. It is NOT neces-
sary to change the PCM. The PROHEAT
may be used with the Temperature
Sensor T2 circuit if only one sensor is
required. Leave the Temperature Sensor
connected to PCM connection T2 and
operate the PROHEAT as normal.
3.1.6
(6 Flashes)
TEMP SENSOR T1: Step 1
(7 or 9 Flashes)
3.1.7
(7 or 9 Flashes)
Figure 3-34: Temperature Sensors
T2
T1
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