New Holland WorkMaster 50 Service Manual page 913

DTC 32B-03-Glow plug control circuits shorted to battery
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 to a voltage source condition in one or more of the 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
circuit to a voltage source condition exists in one or more of the glow plug circuits.
Possible failure modes:
1. Faulty glow plug control circuit wiring, short to a voltage source.
2. Faulty glow plug control module Z-9101, internal failure.
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 4.
2. Check each of the glow plug circuits for a short to a voltage source condition.
Disconnect the vehicle harness (VE) from the glow plug control module Z-9101 at connector X-9113.
Disconnect the vehicle harness (VE) from each of the glow plugs.
With the key in the ON position, use a multimeter to perform the following voltage check for a short to a voltage
source on the vehicle harness (VE) side :
From
X-9034 pin 1
X-9035 pin 1
X-9036 pin 1
A. If there is voltage measured on any of the checks, there is a short to a voltage source condition in the glow
plug circuit wiring in the vehicle harness (VE). Locate and repair the shorted conductor.
B. If there is no voltage measured on any of the checks, continue to Step 3.
3. Replace the glow plug control module Z-9101, then use EST to check to see that this fault has been resolved.
A. If the fault has been resolved, return the machine to service.
B. If the fault has not been resolved, check the ECU A-9000 for the appropriate software and re-flash, if necessary.
4. Visually inspect the relevant harnesses and connectors for damage, bent or dislocated pins, corroded terminals,
or broken wires. Verify that the connectors are fully installed. Flex the harnesses involved to reveal intermittent
breaks or shorts in the wiring concerned. Operate the machine while you monitor the display.
Electrical systems - FAULT CODES
To
chassis ground
chassis ground
chassis ground
47866583_ 02/12/2015
55.12 [55.DTC] / 192
Result
There should be no voltage.
There should be no voltage.
There should be no voltage.