New Holland Workmaster 50, Service Manual

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Electrical systems - FAULT CODES
DTC 32B-04-Glow plug control circuits shorted to ground
Control Module : ECU
Context:
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 ground condition in one or
more of the glow plug circuits, this fault will occur. 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) .
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 to ground condition.
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 To Result
X-9034 pin 1 chassis ground
There should be 0.2 - 5.0 Ω .
X-9035 pin 1 chassis ground There should be 0.2 - 5.0 Ω .
X-9036 pin 1 chassis ground There should be 0.2 - 5.0 Ω .
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 faulted 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 To Result
X-9113 pin 2 chassis ground There should be no continuity.
X-9113 pin 7 chassis ground There should be no continuity.
X-9113 pin 1 chassis ground There should be no continuity.
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