New Holland Workmaster 50, Service Manual, Page: 961 / 1067

Electrical systems - FAULT CODES
DTC 52C-01-Glow Control Unit (GCU) data error
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) . For more information regarding glow
plugs, see Glow plug system - Overview (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 determines the diagnostic data transmission is faulty, this fault will occur.
Cause:
The glow plug control module Z-9101 diagnostic connection with the ECU A-9000 is damaged or the data protocol is
incorrect.
Possible failure modes:
1. Faulty glow plug control module Z-9101 diagnostic circuit wiring, open, shorted or grounded circuit.
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 for damaged diagnostic circuit wiring.
Disconnect the vehicle harness (VE) from the ECU A-9000 at connector X-9102 .
With the key in the OFF position, use a multimeter to check for continuity on the vehicle harness (VE) side :
From To Result
X-9102 pin K22 chassis ground There should be no continuity.
X-9102 pin K22 all other pins in connector X-9102 There should be no continuity.
Carefully disconnect the vehicle harness (VE) from the glow plug control module Z-9101 at connector X-9113 .
Place a jumper wire between connector X-9113 pin 3 and chassis ground.
With the key in the OFF position, use a multimeter to check for continuity on the vehicle harness (VE) side :
From To Result
X-9102 pin K22 chassis ground There should be continuity.
A. If there is continuity from connector X-9102 pin K22 to ground or any other pin in connector X-9102 there is a
short to ground condition. If there is no continuity from X-9102 pin K22 to connector X-9113 pin 3 , there is an
open circuit condition is in the vehicle harness (VE), wire VE-9073.
Use the appropriate service manual, if necessary, to locate and repair the damage in the circuit.
B. If there is no continuity from connector X-9102 pin K22 to ground or any other pin in connector X-9102 and
there is continuity from X-9102 pin K22 to connector X-9113 pin 3 , continue with Step 3 .
3. Replace the glow plug control module Z-9101, then use EST to check to see that this fault has been resolved.
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