EGR System Test (Federal)
- Place transmission in Park (A/T) or Neutral (M/T) and transfer case lever in 2H position. Apply parking brake. With coolant temperature less than 131°F (55°C), start engine and operate at high RPM. EGR valve diaphragm should not retract.
- Warm engine to normal operating temperature. Operate engine at high RPM. EGR valve diaphragm should retract.
- If EGR valve does not operate as specified, check for misrouted, restricted, clogged or deteriorated vacuum hoses. If vacuum hoses are okay, check EGR valve, EGR modulator, VSV, wire harness and ECM. See EGR VALVE and EGR MODULATOR. See Fig 1
.
- If EGR valve and EGR modulator are okay, check EGR Vacuum Switching Valve (VSV). See EGR VACUUM SWITCHING VALVE (VSV).
- If VSV is okay, disconnect ECM connector. Check Light Green/Yellow wire from terminal A5 for short to ground, an open circuit, or poor connections at ECM or VSV connectors. If wires and connections are okay, substitute a known-good ECM and retest.
Courtesy of SUZUKI OF AMERICA CORP.