PROHEAT M-SERIES SERVICE MANUAL
3-33
COOLANT PUMP Diagnostic Code
Indicates an over-load fault is detected.
Troubleshoot the Coolant Pump diagnostic code based on:
Coolant Pump and PCM – electrical.
Test Procedure – Coolant Pump and PCM test:
a) Disconnect the Coolant Pump at the PCM.
b) Switch the PROHEAT on and observe for a diagnostic code.
If a Coolant Pump diagnostic code is NOT indicated and the PROHEAT
operates, the Coolant Pump is faulty. Go to Coolant Pump replacement.
If the Coolant Pump diagnostic code is still indicated, the PCM is faulty.
Go to PCM replacement, page 3-39.
Coolant Pump replacement:
a) Isolate the Coolant Pump using shut-off valves provided in the coolant
system or hose to minimize coolant loss.
b) Remove Coolant Pump.
c) Install new Coolant Pump.
3.1.11
(11 Flashes)
Figure 3-39: PCM Coolant Pump Connection
PCM COOLANT PUMP
CONNECTION
CAUTION
Before starting the PROHEAT
ensure that the Coolant Pump is
flooded with coolant by opening all
valves and running the engine until
the air has been purged from the
system (approximately 15 – 20
minutes). This will prevent Coolant
Pump damage.
WARNING
NEVER remove coolant lines when
the engine 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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