Grand Vitara, Vitara & XL-7
- Check engine idle speed and Idle Air Control (IAC) duty cycle. See IDLE SPEED under IDLE SPEED & MIXTURE in ON-VEHICLE ADJUSTMENTS article. If idle speed is within specification, go to next step. If idle speed is not as specified, go to step 3 .
- With engine operating at normal temperature and running at idle speed, turn headlights, heater blower and rear defogger ON. If idle speed stays within specifications, this part of system is operating properly. If idle speed drops below specification, go to next step.
- Perform IAC valve component test. See IDLE AIR CONTROL VALVE under IDLE CONTROL SYSTEM in SYSTEM & COMPONENT TESTING article. If check results are okay, go to next step. If check results are faulty, check all IAC valve circuits for open or short. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. If IAC valve circuits are faulty, repair as necessary. If IAC valve circuits are okay, substitute ECM with known-good module and retest system for normal operation.
- If idle speed was not as specified in step 1
, go to next step. If idle speed was as specified in step 1
, check for malfunction at following systems and system components:
- Air induction system (clogged).
- Engine coolant temperature sensor malfunction.
- Engine mechanical malfunction.
- EGR valve malfunction.
- EVAP system malfunction.
- High accessory engine load (A/C, P/S & Lighting).
- Manifold absolute pressure sensor malfunction.
- PCV system malfunction.
- Throttle position sensor malfunction.
- Transmission range switch signal.
- Vacuum leaks.
- If idle speed was higher than specified in step 1 , go to next step. If idle speed was lower than specified in step 1 , go to step 8 .
- Turn ignition switch to LOCK position. Disconnect appropriate ECM harness connector E61. ECM is located under instrument panel, behind glove box. See Figure
. Turn ignition switch to ON position. Using DVOM, check A/C (input) signal circuit by measuring voltage between ground and appropriate ECM connector. See CHECKING A/C SWITCH SIGNAL CIRCUIT
. See Fig 1
. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Voltage should be 10-14 volts with A/C and blower switch OFF. And 0-1.5 volts with A/C and blower switch ON. If A/C (input) signal circuit is okay, go to next step. If A/C (input) signal circuit is faulty, repair open or short circuit in appropriate wire between A/C control module and ECM. After repair, retest system for normal operation.CHECKING A/C SWITCH SIGNAL CIRCUIT
Application ECM Harness Connector/Terminal (Wire Color) Grand Vitara E61/28 (Green/Black) Vitara E61/17 (Yellow/Black wire) XL-7 E61/17 (Green/Black) - If IAC valve duty was less than about 2% in step 1 , check air induction system, PCV valve and EVAP canister purge control system for proper operation, repair as necessary. If IAC valve duty was more than about 2% in step 1 , check TP sensor (close throttle position) and ECT sensor for performance. If sensors are faulty, replace as necessary. If sensors are okay, substitute ECM with known-good module and retest system for normal operation.
- Check transmission range signal, referring to DTC P0705 & P0707: TRANSMISSION RANGE SENSOR CIRCUIT MALFUNCTION (P, R, N, D & L INPUT)/TRANSMISSION RANGE SENSOR CIRCUIT LOW INPUT under appropriate DIAGNOSIS article in AUTOMATIC TRANSMISSIONS. If test results are okay, go to next step. If test results are faulty, repair as necessary. After repair, retest system for normal operation.
- If IAC valve duty was more than about 30% in step 1
, check for malfunction at following systems and systems components:
- Air induction system.
- EGR valve malfunction (leakage from valve seat).
- High accessory engine load.