New Holland WorkMaster 50 Service Manual page 917

DTC 32B-12-Glow plug control circuits shorted
Control Module : ECU
Context:
For information regarding the functional operation of the glow plug control module Z-9101 see Glow plug system
Glow plug control module - Overview – Glow plug control module (55.202). The Engine Control Unit (ECU)
A-9000 requests operation of the glow plug control module Z-9101 via a Pulse Width Modulated (PWM) control circuit
and monitors the status of possible electrical defects via a diagnostic feedback signal from the glow plug control
module Z-9101. If the ECU A-9000 is notified of a short circuit to ground, over current, condition in one or more of the
glow plugs or glow plug circuits, this fault will occur.
Cause:
The glow plug control module Z-9101 has communicated to the ECU A-9000, via a diagnostic connection, that a short
to ground circuit condition exists in one or more of the glow plugs or glow plug circuits.
Possible failure modes:
1. Faulty glow plug, internal failure.
2. Faulty glow plug control circuit wiring, short circuit.
3. Faulty ECU A-9000, software.
Solution:
1. Verify that the fault is present and active.
Use the Electronic Service Tool (EST) to check the status of this fault.
A. If the fault is present and active, continue with Step 2.
B. If the fault is no longer present or in an inactive state, the fault may be intermittent and not currently active.
Continue with Step 5.
2. Check each of the glow plugs for a short to ground condition.
Disconnect the vehicle harness (VE) from each of the glow plugs at connectors X-9034, X-9035, and X-9036.
Use a multimeter to measure the resistance of each glow plug on the glow plug pin :
From
X-9034 pin 1
X-9035 pin 1
X-9036 pin 1
A. If there is a nominal amount of resistance measured on each of the glow plugs, leave all of the glow plugs
disconnected and continue with Step 3.
B. If there is less than 0.2 Ω resistance measured on any of the glow plugs, that glow plug has failed internally,
replace the failed glow plug.
3. Check the glow plug control circuits in the vehicle harness (VE) for a short to ground circuit condition.
Disconnect the vehicle harness (VE) from the glow plug control module Z-9101 at connector X-9113.
With the key in the OFF position, use a multimeter to check for a short to ground condition on the vehicle harness
(VE) side :
From
X-9113 pin 2
X-9113 pin 7
X-9113 pin 1
Electrical systems - FAULT CODES
To
chassis ground
chassis ground
chassis ground
To
chassis ground
chassis ground
chassis ground
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Result
There should be 0.2 - 5.0 Ω.
There should be 0.2 - 5.0 Ω.
There should be 0.2 - 5.0 Ω.
Result
There should be no continuity.
There should be no continuity.
There should be no continuity.