Diagnostic Trouble Code (Dtc) P0402 Exhaust Gas Recirculation (Egr) Excessive Flow Detected - Isuzu 1999 RODEO Workshop Manual

DIAGNOSTIC TROUBLE CODE (DTC) P0402 EXHAUST GAS RECIRCULATION
Circuit Description
The Powertrain Control Module (PCM) closes the
Exhaust Gas Recirculation (EGR) system on engine
start–up to test for excessive (any) flow. If the PCM
determines that EGR flow occurred on start–up, in two
consecutive trips, then DTC P0402 will set. DTC P0402 is
a type B code.
Conditions for Setting the DTC
f Intake Air Temperature (IAT) is above 5°C (41°F).
f Engine RPM is less than 500 RPM.
f EGR Pintle Position if greater than 55 counts.
The above mentioned conditions must be met for 0.6
seconds during engine start–up on two consecutive trips.
Diagnostic Aids
Check for the following conditions:
RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
(EGR) EXCESSIVE FLOW DETECTED
f Poor connection or damaged harness – Inspect the
wiring harness for damage. If the harness appears to
be OK, observe the Actual EGR Position display on the
Tech 2 while moving connectors and wiring harnesses
related to the EGR valve. A change in the display will
indicate the location of the fault.
f Ensure EGR valve is correctly mounted. See
On–Vehicle Service.
Reviewing the Failure Records vehicle mileage since the
diagnostic test last failed may help determine how often
the condition that caused the DTC to be set occurs. This
may assist in diagnosing the condition.
NOTE: If the EGR valve shows signs of excessive heat,
check the exhaust system for blockage (possible a
plugged catalytic converter) using the "Restricted
Exhaust System Check."
6E1–235
D06RX055