New Holland WorkMaster 50 Service Manual page 970

DTC 58D-03-Throttle valve actuator control circuit high side shorted
to battery
Control Module : ECU
Context:
The Engine Control Unit (ECU) A-9000 monitors the throttle valve actuator Z-9001 output 1 and output 2 h-bridge
circuits. If the ECU A-9000 detects a short to high source condition in the throttle valve actuator Z-9001 output 1
h-bridge circuit, this fault will occur.
Cause:
The ECU A-9000 has detected a short to high source condition in the throttle valve actuator Z-9001 output 1 h-bridge
circuit.
Possible failure modes:
1. Faulty throttle valve actuator Z-9001 wiring, short to a voltage source.
2. Faulty throttle valve actuator Z-9001, internal failure.
3. Faulty ECU A-9000, software.
Solution:
1. Verify 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 6.
2. Check the throttle valve actuator Z-9001 output 1 h-bridge wiring for a short to battery condition.
Disconnect the engine harness (EN) from the throttle valve actuator Z-9001 at connector X-9011.
Disconnect the engine harness (EN) from the ECU A-9000 at connector X-9001.
With the key in the ON position, use a multimeter to perform the following voltage check on the engine harness
(EN) side :
From
X-9011 pin 6
A. If there is voltage, there is a short to battery in the throttle valve actuator Z-9001 output 1 h-bridge circuit.
Locate and repair the shorted conductor.
B. If there is no voltage, leave connectors X-9011 and X-9001 disconnected and continue to Step 3.
3. Check the throttle valve actuator Z-9001 engine harness (EN) wiring for a short to high source condition.
With the key in the OFF position, use a multimeter to perform the following continuity check on the engine harness
(EN) side :
From
X-9011 pin 6
X-9011 pin 6
X-9011 pin 6
A. If there is continuity, there is a short to high source in the throttle valve actuator Z-9001 output 1 h-bridge circuit.
Locate and repair the shorted conductor.
Electrical systems - FAULT CODES
To
Chassis ground
To
X-9011 pin 1
X-9011 pin 2
Chassis ground
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Value
There should be no voltage.
Value
There should be no continuity.
There should be no continuity.
There should be no continuity.