Proheat M80 Manuel de service télécharger pdf (Page 62)

4-25

PROHEAT M-SERIES G-II PCM SERVICE MANUAL

4.1.5

(4 Flashes)

CAUTION

Repeatedly resetting the PROHEAT

without resolving the Overheat

diagnostic code will damage the

heat exchanger.

Procedure – Mechanical inspection and testing:

a) Connect the power directly to the Coolant Pump. Observe the operation.

If the Motor does not operate, replace the Coolant Pump.

OVERHEAT Diagnostic Code 4

Indicates that the Temperature Sensor detected an inner heat exchanger

surface temperature of 257°F (125°C). The G-II PCM will detect overheats

even if the heater is not switched on.

Troubleshoot the Overheat diagnostic code based on:

1. Lack of coolant, air or flow problems in the coolant system.

Go to page 4-24, Steps 1 and 2.

2. Faulty Temperature Sensor. Go to page 4-27.

3. Faulty G-II PCM Temperature Sensor circuit. Go to page 4-27.

An Overheat will put the heater in Lockout Mode (requires power to the G-II

PCM to be removed and reapplied) on the first occurrence of an Overheat.

Figure 4-26: G-II PCM Coolant Pump Output Voltage Measurement.

RED (+) BLACK (-)

WARNING

NEVER remove coolant lines when

the engine/system is HOT – escaping

steam or scalding water could cause

serious personal injury. Loosen the

coolant line clamps slowly, allowing

the pressure to escape before

removing completely.

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Proheat M80 Manuel de service Page 62