New Holland WorkMaster 50 Service Manual page 911

DTC 32B-02-Glow plug control circuits open
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 an open circuit 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 an
open 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, open 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 an open circuit 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 the glow plugs 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 infinite resistance measured on any of the glow plugs, that glow plug has failed internally, replace
the faulted glow plug.
3. Check the glow plug control circuits for an open circuit condition.
Disconnect the vehicle harness (VE) from the glow plug control module Z-9101 at connector X-9113.
Use a multimeter to perform the following continuity check for an open circuit 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
X-9034 pin 1
X-9035 pin 1
X-9036 pin 1
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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 continuity.
There should be continuity.
There should be continuity.