New Holland Workmaster 50, Service Manual

Page: 907 / 1067

Electrical systems - FAULT CODES
DTC 2E1-04-Starter relay low side driver circuit shorted to ground
Control Module : ECU
Context:
The Engine Control Unit (ECU) A-9000 controls the starter control relay K-9104 using a low side and high side driver.
If the ECU A-9000 detects a short circuit to ground in the low side driver circuit, this fault will occur.
Cause:
The ECU A-9000 has detected a short circuit to ground in the starter control relay K-9104 low side driver circuit.
Possible failure modes:
1. Faulty starter control relay K-9104 wiring, short to ground.
2. Faulty starter control relay K-9104, 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 4 .
2. Check the starter control relay K-9104 coil internal resistance.
Remove the starter control relay K-9104.
Use a multimeter to perform the following resistance check on the starter control relay K-9104 pins :
From To Value
X-9120 pin 85 X-9120 pin 86 There should be approximately 70 -
130 Ω .
A. If there is approximately 70 - 130 Ω , leave the relay disconnected and continue to Step 3 .
B. If there is not approximately 70 - 130 Ω , the relay starter control relay K-9104 has failed. Replace the starter
control relay K-9104.
3. Check the starter control relay K-9104 low side driver vehicle harness (VE) wiring for a short to ground condition.
With the key in the OFF position, use a multimeter to perform the following continuity check on the vehicle harness
(VE) side :
From To Value
X-9120 pin 85 Chassis ground There should be no continuity.
Disconnect the ECU A-9000 connector X-9102 .
With the key in the OFF position, use a multimeter to perform the following continuity check on the vehicle harness
(VE) side :
From To Value
X-9102 pin K27 All pins in connector X-9102 There should be no continuity.
A. If there is continuity, there is a short circuit in the starter control relay K-9104 vehicle harness (VE) wiring. Use
the appropriate service manual, if necessary, to locate and repair the shorted conductor.
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