New Holland WorkMaster 50 Service Manual page 737

DTC 133-03-Intake manifold temperature sensor voltage is higher
than expected
Control Module : ECU
Context:
The Engine Control Unit (ECU) A-9000 monitors the intake manifold temperature sensor B-9001 signal circuit. If the
ECU A-9000 determines that the intake manifold temperature sensor B-9001 signal circuit voltage is greater than
4.94 V, this fault will occur.
Cause:
The ECU A-9000 has determined that the intake manifold temperature sensor B-9001 signal circuit voltage is greater
than 4.94 V
Possible failure modes:
1. Faulty intake manifold temperature sensor B-9001 wiring, short to a voltage source.
2. Faulty intake manifold temperature sensor B-9001 wiring, open circuit.
3. Faulty intake manifold temperature sensor B-9001, internal failure.
4. 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 intake manifold temperature sensor B-9001 wiring for a short to battery condition.
Disconnect the engine harness (EN) from the intake manifold temperature sensor B-9001 at connector X-9003.
With the key in the OFF position, use a multimeter to perform the following voltage check on the engine harness
(EN) side :
From
X-9003 pin 2
With the key in the ON position, use a multimeter to perform the following voltage check at the engine harness
(EN) side of the connector from :
From
X-9003 pin 2
A. If the specified values are not measured, there is a short to a voltage source in the intake manifold temperature
sensor B-9001 signal circuit. Use the appropriate service manual, if necessary, to locate and repair the shorted
conductor.
B. If the specified values are measured, leave connector X-9003 disconnected and continue to Step 3.
3. Check the intake manifold temperature sensor B-9001 wiring for an open circuit condition.
Disconnect the engine harness (EN) from the ECU A-9000 at connector X-9001.
With the key in the OFF position, use a multimeter to perform the following continuity check for an open circuit on
the engine harness side:
Electrical systems - FAULT CODES
To
Chassis ground
To
Chassis ground
47866583_ 02/12/2015
55.12 [55.DTC] / 16
Value
There should be no voltage.
Value
There should be less than 5.5 V.