Coolant Pump Diagnostic Code 11 - Proheat M50 G-II PCM Service Manual

(11 Flashes)
NOTICE
All plugs/harnesses must be rein-
stalled into the G-II Proheat Control
Module (G-II PCM) before heater
goes back into service.
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.
CAUTION
DO NOT run a coolant pump dry.
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 (approx-
imately 15 – 20 minutes). This will
prevent Coolant Pump damage.
PROHEAT M-SERIES G-II PCM SERVICE MANUAL
4.1.12

COOLANT PUMP Diagnostic Code 11

Indicates an over-load fault is detected. (Pump is drawing more than 10 amps.)
Troubleshoot the Coolant Pump diagnostic code based on:
Coolant Pump and G-II PCM – electrical.
Test Procedure – Coolant Pump and G-II PCM test:
a) Disconnect the Coolant Pump at the G-II 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 G-II PCM is faulty.
Go to G-II PCM replacement, page 4-38.
Figure 4-33: G-II PCM Coolant Pump Connection.
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.
G-II PCM COOLANT PUMP
CONNECTION
4-31