Isuzu 20LE - Verify Repair Go to Step

6E1-230 DRIVEABILITY AND EMISSIONS
• This malfunction detects a low impedance short to
ground or open contact on the ECM out put circuit.
DTC (Flash DTC = 91)
Tacho Out Low Error
Step Action Value(s) Yes No
1
Was the "On-Board Diagnostic (OBD) System Check"
performed?
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Go to Step 2
Go to OBD
System Check
2
1. Ignition OFF.
2. Check for a faulty connection or damaged terminals at
the ECM connector.
Was a problem found?
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Verify repair Go to Step 3
3
Check for a faulty connection or damaged terminals at the
ECM connector.
Was a problem found?
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Verify repair Go to Step 4
4
1. Check for an open or short to ground in the circuit
between the meter cluster connector and the ECM
connector.
If a problem is found, repair as necessary.
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Verify repair Go to Step 5
5
1. Check for an open circuit between the meter cluster
connector and the ground.
If a problem is found, repair as necessary.
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Verify repair Go to Step 6
6
1. Check for an open circuit between the meter cluster
and battery feed.
If a problem is found, repair as necessary.
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Verify repair Go to Step 7
7
1. Disconnect the meter cluster Panel.
2. Check the tacho meter circuit for an open.
Was a problem found?
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Go to Step 5 Go to Step 9
8
1. Disconnect the ECM and CKP sensor.
2. Check for an open in the 58X reference circuit between
the connector and the ECM harness connector.
3. If a problem is found, repair as necessary.
Was a problem found?
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Verify repair Go to Step 9
9
1. Reconnect the ECM and CKP sensor.
2. Connect a Digital Voltmeter (DVM) to measure voltage
on the 58X reference circuit at the ECM connector.
3. Observe the voltage while cranking the engine.
Is the voltage near the specified value?
2.5V
Go to Step 12 Go to Step 10
10
Check the connections at the CKP sensor and replace the
terminals if necessary.
Did any terminals require replacement?
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Verify repair Go to Step 11
11
Replace the CKP sensor.
Is the action complete?
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Verify repair
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12
Check connections at the ECM and replace the terminals
if necessary.
Did any terminals require replacement?
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Verify repair Go to Step 13
13
Replace the EPROM or ECM.
Is the action complete? Note) Refer to 6E1-243.
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Verify repair
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