Isuzu 1999 RODEO Workshop Manual page 874

DTC P0406 EGR Sensor Circuit High (Cont'd)
Step
9 1. Ignition ON, Engine OFF.
2. Using a Digital Voltmeter (DVM), check for voltage
on the 5 volt Reference signal circuit at the Linear
Exhaust Gas Recirculation (EGR) Valve wiring
harness connector.
Does the DVM read the following value?
10 Check the 5 volt Reference signal circuit, between the
EGR and the PCM, for the following conditions:
f
An open circuit
f
A short to ground
f
A short to voltage
Was the problem found?
11 1. Ignition OFF.
2. Place a DVM between the 5 volt Reference signal
circuit and the 5 volt signal return (ground) circuit at
the EGR wiring harness connector.
3. Ignition ON, Engine OFF.
Does the DVM read the following value?
12 Check the 5 volt signal return (ground) circuit, between
the EGR and the PCM, for the following conditions:
f
An open circuit
f
A short to ground
f
A short to voltage
Was the problem found?
13 1. Ignition OFF.
2. Place a fused jumper wire between the 5 volt
Reference signal circuit and the EGR valve position
feedback circuit at the EGR wiring harness
connector.
3. Ignition ON, Engine OFF.
4. Observe the EGR value on the Tech 2.
Does the Tech 2 display the following value(s)?
14 Replace the Linear Exhaust Gas Recirculation (EGR)
Valve.
Verify Repair.
15 Replace the PCM.
IMPORTANT: The
programmed. Refer
Powertrain Control
procedures.
And also refer to latest Service Bulletin.
Check to see if the Latest software is released or not.
And then Down Load the LATEST PROGRAMMED
SOFTWARE to the replacement PCM.
Verify repair.
RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
Action
replacement PCM must
to On–Vehicle Service in
Module and Sensors
Value(s)
Go to Step 11
about 5 volts
— Verify repair
Go to Step 13
about 5 volts
— Verify repair
Go to Step 14
5 volts 100%
—
be
for
—
6E1–247
Yes No
Go to Step 10
Go to Step 11
Go to Step 12
Go to Step 15
Go to Step 15
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