New Holland Workmaster 50, Service Manual

Page: 759 / 1067

Electrical systems - FAULT CODES
DTC 141-02-Crankshaft speed sensor values are not plausible
Control Module : ECU
Context:
The Engine Control Unit (ECU) A-9000 monitors the crankshaft position sensor B-9007 characteristics for angle,
speed determination, signal plausibility, and quality. If the ECU A-9000 determines that there are no crankshaft posi-
tion signals detected for at least 4 engine revolutions, this fault will occur.
Cause:
The ECU A-9000 has determined that there is no crankshaft position signals detected for at least 4 engine revolutions.
Possible failure modes:
1. Faulty crankshaft position sensor B-9007, not fully seated or loose.
2. Faulty crankshaft tone wheel, damaged or misaligned.
3. Faulty crankshaft position sensor B-9007 wiring, short circuit.
4. Faulty crankshaft position sensor B-9007, internal failure.
5. 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 7 .
2. Check the physical integrity of the crankshaft position sensor B-9007. The sensor should be fully seated and
mounted tightly.
Remove the crankshaft position sensor B-9007 and inspect the crankshaft tool wheel. The tone wheel should not
be damaged or loose.
A. If the sensor or tone wheel is damaged or is not mounted/secured properly, repair as necessary.
B. If the sensor or tone wheel is not damaged and is mounted/secured properly, continue to Step 3 .
3. Check the crankshaft position sensor B-9007 wiring for a short circuit to battery condition.
Disconnect the engine harness (EN) from the crankshaft position sensor B-9007 at connector X-9039 .
With the key in the OFF position, use a multimeter to perform the following voltage check on the engine harness
(EN) side :
From To Value
X-9039 pin 2 Chassis ground There should be no voltage.
X-9039 pin 1 Chassis ground There should be no voltage.
A. If there is no voltage, leave connector X-9039 disconnected and continue to Step 4 .
B. If there is voltage, there is a short circuit to battery in the crankshaft position sensor B-9007 engine harness
(EN) wiring. Locate and repair the shorted conductor.
4. Check the crankshaft position sensor B-9007 engine harness (EN) wiring.
With the key in the ON position, use a multimeter to perform the following voltage check on the engine harness
(EN) side :
47866583_ 02/12/2015
55.12 [55.DTC] / 38