Isuzu 1999 RODEO Workshop Manual page 1555

6E2–312
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
Step
1 Was the "On-Board Diagnostic (OBD) System Check"
performed?
2 1. Ignition "ON," engine "OFF", review and record
Tech 2 Failure Records Data.
2. Operate the vehicle within Failure Records
conditions as noted.
3. Using a Tech 2, monitor "DTC" info for DTC P0405
until the DTC P0405 test runs. Note the result.
Does the Tech 2 indicates DTC P0405 failed this
ignition?
3 1. Disconnect the EGR valve harness connector.
2. Inspect the EGR valve and connectors for damaged
pin or terminals.
Were there any damaged pins or terminals?
4 Repair the damaged pin or terminal.
Is the action complete?
5 1. Disconnect the EGR harness connector.
2. Ignition "ON".
3. At the EGR valve, use a DVM to check the voltage
at the 5 volt reference wire (RED) and ground (B).
Did the DVM indicate the specified value?
6 1. Disconnect the EGR harness connector.
2. Measure resistance between terminal B and D.
Was resistance in range?
7 1. Ignition "ON".
2. At the PCM connector, backprove with a DVM at the
5 volt reference for the EGR valve.
Did the DVM indicate the specified value?
8 Repair the open 5 volt reference circuit.
Is the action complete?
9 Repair the damaged sensor ground wire.
Is the action complete?
10 1. Disconnect the EGR harness
2. Use an ohmmeter to measure between the pintle
position pin and the sensor ground pin on the EGR
valve.
NOTE: J-35616 Connector Test Adapter Kit may be
useful for gaining access to the recessed pins on the
valve.
Was the ohmmeter reading approximately equal to the
specified value?
11 1. Ignition "ON".
2. Backprobe with a DVM to measure voltage at EGR
valve pintle position pin and sensor ground pin.
Was voltage in range?
DTC P0405 – EGR Low Voltage
Action Value(s) Yes
— Go to Step 2
— Go to Step 3
Go to Step 4
—
— Verify repair
Go to Step 6
4–6 V
5–5.5 KW Go to Step 10
4–6 V Go to Step 8
— Verify repair
— Verify repair
1 to 1.25 KW Go to Step 13
Less than 0.1
Go to Step 17
V
No
Go to OBD
System
Check
Refer to
Diagnostic
Aids
Go to Step 5
—
Go to Step 7
Go to Step 17
Go to Step 18
—
—
Go to Step 17
Go to Step 12