Isuzu N-Series. Manual - part 463
6E-188 EMISSION AND ELECTRICAL DIAGNOSIS
Step
Action
Value
YES
NO
1
Was the “Diagnostic system check” per-
formed?
—
Go to diagnostic
system check
2
1. Ignition “OFF”
2. Disconnect the Relay from the Relay box
connector.
3. Ignition “ON” Engine “OFF”
4. Using the Digital Voltmeter (DVM), check
for voltage on the “Power supply side ter-
minal” terminal of the Relay Box Connec-
tor.
Does the DVM read the following value?
12 Volt or 24
Volt
3
1. Check the suspect circuit between the
Relay connector.
Fuse for the following condition.
• A short to ground
• An open circuit
2. Repair if necessary.
Has DTC 41 been corrected?
—
—
4
Using the DVM, check the resistance of inter
“4” “5” Relay terminal.
Does the DVM read the following Value?
23
Ω (for 12
Volt)
100
Ω (for 24
Volt)
5
1. Ignition “OFF”
2. Disconnect the ECM connector from
ECM.
3. Check the Relay circuit between the ECU
and Relay connector.
• A short to ground
• An open circuit
4. Repair if necessary.
Has DTC 41 been corrected?
—
6
Replace the Relay.
Is the action complete?
—
—
7
Replace the ECM.
Is the action complete?
—
—
8
1. Reconnect all the connectors removed.
2. Ignition “ON”, Engine “OFF”
Does DTC 41 come normal condition?
—
9
Is any current trouble other than DTC 41 dis-
played by indicator light?
—
Go to trouble code
section
Trouble code clear