Engine Controls - Self-Diagnostics - Tests: Other Kia Sephia II

Procedure

1. Check air cleaner. If air cleaner is dirty, replace air cleaner. If air cleaner is okay, go to next step.
2. Check oil cap and oil dipstick installation. If problem exists, repair as necessary. If problem does not exist, go to next step.
3. Check intake tube, breather hose and MAF sensor for air leaks. If problem exists, repair as necessary. If problem does not exist, go to next step. CAUTION: DO NOT spray carburetor cleaner on or near coils or plug wires. Allow enough time between checking areas for leaks for carburetor spray to dissipate.
4. Backprobe and measure voltage between front Heated Oxygen Sensor (HO2S) connector terminal No. 4 (Green/Brown wire) and ground. see scheme 8 Start engine and allow it to reach normal operating temperature. With engine idling, spray short spurts of aerosol carburetor cleaner into following areas while observing voltage changes at Green/Brown wire: Throttle body gasket. Gasket between intake manifold and cylinder head. Gasket between intake manifold and surge tank. Seals between intake manifold and fuel injectors. Seal between surge tank and PCV pipe. A long rise in voltage that corresponds to approximate timing and duration of spray of carburetor cleaner indicates air leak in area sprayed. If leak is indicated, repair as necessary. If leak is not indicated, go to next step.
5. Check MAF sensor for contamination, deterioration or damage. If MAF sensor is okay, go to next step. If MAF sensor is contaminated, clean with aerosol brake cleaner and let air dry. Check air cleaner and housing for source of leak and repair as necessary. If MAF sensor is damaged or deteriorated, replace MAF sensor.
6. Disconnect Throttle Position (TP) sensor 3-pin connector. Connect ohmmeter between TP sensor connector terminals No. 2 and 3 (Blue/White wire and Blue/Orange wire - component side). see scheme 13 With throttle closed, resistance should be 1.6-2.4 k/ohms. As throttle is opened, resistance should increase linearly to 4-5 k/ohms at wide open throttle. If resistances are as specified, go to next step. If resistances are not as specified, replace TP sensor.
7. Start engine and allow it to reach normal operating temperature. Backprobe and measure voltage between ECM connector terminal No. 41 (Red/White wire) and ground. see scheme 6 Measure voltage at idle and while revving engine up to 3000 RPM. At sea level and 50% relative humidity, voltage should be.9-1.1 volts at idle and increase linearly to about 1.7 volts at 3000 RPM. If voltages are as specified, go to next step. If voltages are not as specified, check MAF sensor wiring and connector for damage. If problem exists, repair wiring or connector as necessary. If problem does not exist, replace MAF sensor.
8. Turn ignition off. Disconnect ECM and TP sensor connectors. Measure resistance of Black/Green wire between TP sensor connector terminal No. 1 and ECM connector terminal No. 71. see scheme 6and see scheme 13. Also, measure resistance of Blue/White wire between TP sensor connector terminal No. 2 and ECM connector terminal No. 59. And measure resistance of Blue/Orange wire between TP sensor connector terminal No. 3 and ECM connector terminal No. 73. If each resistance is less than one ohm, go to next step. If any resistance is one ohm or more, repair appropriate wire(s) between TP sensor and ECM.
9. Connect TP sensor connector. Disconnect MAF sensor 4-pin connector. Measure resistance of Red/Blue wire between MAF sensor connector terminal No. 2 and ECM connector terminal No. 14. see scheme 6and see scheme 12. Also measure resistance of Red/White wire between MAF sensor connector terminal No. 4 and ECM connector terminal No. 41. And measure resistance of Black/Yellow wire between ground and MAF sensor connector terminal No. 1. If each resistance is less than one ohm, clear codes and retest. If any resistance is one ohm or more, repair appropriate wire(s) between MAF sensor and ECM.

1. Run engine at idle. Backprobe and measure voltage between MAF sensor connector terminal No. 3 (Red/Yellow wire) and ground. see scheme 12 If battery voltage exists, go to step 3. If battery voltage does not exist, go to next step.
2. Turn ignition off. Disconnect MAF sensor 4-pin connector. Disconnect engine compartment fuse/relay box Black 68-pin connector C192 (in center of engine compartment fuse/relay box). see scheme 5 Measure resistance of Red/Yellow wire between MAF sensor connector terminal No. 3 and engine compartment fuse/relay box connector C192 terminal No. 6. If resistance is less than one ohm, replace EGI main relay. If resistance is one ohm or more, repair open in Red/Yellow wire.
3. Turn ignition off. Disconnect MAF sensor 4-pin connector and ECM 88-pin connector. Measure resistance of Red/White wire between MAF sensor connector terminal No. 4 and ECM connector terminal No. 41. see scheme 6and see scheme 12. Resistance should be less than one ohm. Check for continuity between ground and ECM connector terminal No. 41. Continuity should not exist. If resistance and continuity are as specified, clear codes and retest. If either resistance or continuity is not as specified, repair open or short to ground in Red/Yellow wire between MAF sensor and ECM.

Turn ignition off. Disconnect MAF sensor 4-pin connector and ECM 88-pin connector. Measure resistance of Red/Blue wire between MAF sensor connector terminal No. 2 and ECM connector terminal No. 14. see scheme 6and see scheme 12. Also, measure resistance of Black/Yellow wire between ground and MAF sensor connector terminal No. 1. Ground point is located behind left side of instrument panel. If each resistance is less than one ohm, clear codes and retest. If either resistance is one ohm or more, repair appropriate wire as necessary.

1. Turn ignition off. Disconnect IAT sensor 2-pin connector. Turn ignition on. Measure voltage between ground and IAT sensor connector terminal No. 1 (Blue/Green wire). Voltage should be about 5 volts. If voltage is as specified, go to next step. If voltage is more than specified, repair short to power in Blue/green wire between IAT sensor and ECM. If voltage is less than specified, repair open or short to ground in Blue/Green wire between IAT sensor and ECM.
2. Turn ignition off. Disconnect ECM 88-pin connector. Measure resistance of Black/Green wire between IAT sensor connector terminal No. 2 and ECM connector terminal No. 71. see scheme 6 If resistance is less than one ohm, go to next step. If resistance is one ohm or more, repair open in Black/Green wire between IAT sensor and ECM.
3. Check for continuity between ground and ECM connector terminal No. 77 (Blue/Green wire). Continuity should not exist. Also, check continuity between ECM connector terminals No. 71 and 77 (Black/Green wire and Blue/Green wire). Continuity should not exist. If each continuity check is as specified, go to next step. If either continuity check is not as specified, repair short to ground in or short between wires.
4. Measure resistance between IAT sensor terminals (component side). Resistance should be 2.205-2.695 k/ohms at 68°F (20°C). If IAT sensor resistance is not as specified, replace IAT sensor. If IAT sensor resistance is as specified, check IAT sensor connector and ECM connector for loose, bent or corroded terminals. If problem exists, repair appropriate connector.

1. Turn ignition off. Disconnect IAT sensor 2-pin connector. Turn ignition on. Measure voltage between ground and IAT sensor connector terminal No. 1 (Blue/Green wire). If voltage is about 5 volts, go to next step. If voltage is more than 5 volts, repair short to power in Blue/Green wire between ECM and IAT sensor. If voltage is less than 5 volts, repair open in Blue/Green wire between ECM and IAT sensor.
2. Turn ignition off. Disconnect ECM 88-pin connector. Measure resistance of Black/Green wire between IAT sensor connector terminal No. 2 and ECM connector terminal No. 71. see scheme 6 If resistance is less than one ohm, check IAT sensor connector and ECM connector for loose, damaged or corroded terminals. If problem exists, repair appropriate connector. If resistance is one ohm or more, repair open in Black/Green wire between IAT sensor and ECM.

Turn ignition off. Disconnect IAT sensor 2-pin connector and ECM 88-pin connector. Check for continuity between ground and IAT sensor connector terminal No. 1 (Blue/Green wire). Continuity should not exist. Also, check for continuity between IAT sensor connector terminals No. 1 and 2 (Blue/Green wire and Black/Green wire). Continuity should not exist. If each continuity is as specified, clear codes and retest system. If either continuity is not as specified, repair short to ground or short between IAT sensor connector wires.

1. Turn ignition off. Disconnect ECT sensor 3-pin connector and ECM 88-pin connector. Measure resistance of Blue/Yellow wire between ECT sensor connector terminal No. 1 and ECM connector terminal No. 78. see scheme 6 If resistance is less than one ohm, go to next step. If resistance is one ohm or more, repair open in Blue/Yellow wire between ECT sensor and ECM.
2. Remove ECT sensor from engine. Measure resistance between ECT sensor terminals No. 1 and 3 (Blue/Yellow wire and Black/Green wire - component side) and compare with expected values. See «ECT SENSOR RESISTANCE SPECIFICATIONS»(ref-3156-S23866585902000041800000) table. If ECT sensor resistances are as specified, check ECT sensor connector and ECM connector for loose, damaged or corroded terminals. If problem exists, repair appropriate connector. If ECT sensor resistances are not as specified, replace ECT sensor.

ECT SENSOR RESISTANCE SPECIFICATIONS

1. Turn ignition off. Disconnect ECT sensor 3-pin connector. Turn ignition on. Measure voltage between ground and ECT sensor connector terminal No. 1 (Blue/Yellow wire). If voltage is about 5 volts, go to next step. If voltage is more than 5 volts, repair short to power in Blue/Yellow wire between ECT sensor and ECM. If voltage is less than 5 volts, repair open in Blue/Yellow wire between ECT sensor and ECM.
2. Turn ignition off. Disconnect ECM 88-pin connector. Measure resistance of Black/Green wire between ECT sensor connector terminal No. 3 and ECM connector terminal No. 71. see scheme 6 If resistance is less than one ohm, check ECT sensor connector and ECM connector for loose, damaged or corroded terminals. If problem exists, repair appropriate connector. If resistance is one ohm or more, repair open in Black/Green wire between ECT sensor and ECM.

Turn ignition off. Disconnect ECT sensor 3-pin connector. Check for continuity between ground and ECT sensor connector terminal No. 1 (Blue/Yellow wire). Continuity should not exist. Also, check for continuity between ECT sensor connector terminals No. 1 and 3 (Blue/Yellow wire and Black/Green wire). Continuity should not exist. If each continuity is as specified, check ECT connector and ECM connector for loose, bent or corroded terminals. If problem exists, repair appropriate connector, then clear codes and retest system. If either continuity is not as specified, repair short to ground or short between IAT sensor connector wires.

1. Turn ignition off. Disconnect TP sensor 3-pin connector. Turn ignition on. Measure voltage between ground and TP sensor connector terminal No. 2 (Blue/White wire). see scheme 13 Voltage should be about 5 volts. If voltage is as specified, go to next step. If voltage is not as specified, go to step 4.
2. Measure voltage between ground and TP sensor connector terminal No. 3 (Blue/Orange wire). Voltage should be 5.6-5.8 volts. If voltage is as specified, go to next step. If voltage is not as specified, go to step 6.
3. Turn ignition off. Measure resistance between TP sensor connector terminals No. 2 and 3 (Blue/White wire and Blue/Orange wire - component side). Resistance should be 1.6-2.4 k/ohms with throttle closed. As throttle is opened, resistance should smoothly increase linearly to over 4 k/ohms at wide open throttle. If resistances are as specified, go to next step. If resistances are not as specified, replace TP sensor.
4. Turn ignition off. Disconnect ECM 88-pin connector. Check for continuity between ground and ECM connector terminal No. 59 (Blue/White wire). see scheme 6 If continuity does not exist, check TP sensor connector and ECM connector for loose, damaged or corroded terminals. If problem exists, repair appropriate connector. If continuity exists, go to next step.
5. Check for source of short to ground. Disconnect CAS and FTPS one at a time while monitoring continuity between ground and ECM connector terminal No. 59 (Blue/White wire). If short to ground is corrected when either component is removed, replace that component. If continuity still exists with CAS and FTPS removed, repair short to ground in Blue/White wire between TP sensor and CAS or FTPS.
6. Turn ignition off. Disconnect ECM 88-pin connector. Check for continuity between ground and ECM connector terminal No. 73 (Blue/Orange wire). If continuity exists, repair short to ground in Blue/Orange wire between ECM and TP sensor. If continuity does not exist, check TP sensor connector and ECM connector for loose, damaged or corroded terminals. If problem exists, repair appropriate connector.

1. Turn ignition off. Disconnect TP sensor 3-pin connector. Turn ignition on. Measure voltage between ground and TP sensor connector terminal No. 3 (Blue/Orange wire). see scheme 13 If voltage is 5.6-5.8 volts, go to next step. If voltage is more than 5.8 volts, repair short to power in Blue/Orange wire between TP sensor and ECM. If voltage is less than 5.6 volts, check TP sensor connector and ECM connector for loose, damaged or corroded terminals. If problem exists, repair appropriate connector. If problem does not exist, repair open in Blue/Orange wire between TP sensor and ECM.
2. Turn ignition off. Disconnect ECM 88-pin connector. Measure resistance of Black/Green wire between TP sensor connector terminal No. 1 and ECM connector terminal No. 71. see scheme 6and see scheme 13. If resistance is less than ohm, go to next step. If resistance is one ohm or more, check TP sensor connector and ECM connector for loose, damaged or corroded terminals. If problem exists, repair appropriate connector. If problem does not exist, repair open in Black/Green wire between TP sensor and ECM.
3. Turn ignition off. Measure resistance between TP sensor connector terminals No. 2 and 3 (Blue/White wire and Blue/Orange wire - component side). Resistance should be 1.6-2.4 k/ohms with throttle closed. As throttle is opened, resistance should smoothly increase linearly to over 4 k/ohms at wide open throttle. If resistances are not as specified, replace TP sensor. If resistances are as specified, check TP sensor connector and ECM connector for loose, damaged or corroded terminals. If problem exists, repair appropriate connector.

1. Turn ignition off. Disconnect front HO2S 4-pin connector and ECM 88-pin connector. Check for continuity between front HO2S connector terminals No. 2 and 4 (Green/Blue wire and Green/Brown wire). see scheme 8 If continuity does not exist, go to next step. If continuity exists, repair short between Green/Blue wire and Green/Brown wire, or short to ground in Green/Brown wire.
2. Connect front HO2S connector. Start and idle engine. When engine reaches operating temperature, backprobe and monitor voltage between front HO2S connector terminal No. 4 (Green/Brown wire) and ground. Voltage should switch between about 400 millivolts and 1100 millivolts at least 3 times in 10 seconds. If voltage is not as specified, replace front HO2S. If voltage is as specified, check front HO2S connector and ECM connector for loose, damaged or corroded terminals. If problem exists, repair appropriate connector.

1. Turn ignition off. Disconnect front HO2S 4-pin connector and ECM 88-pin connector. Check for continuity between ground and ECM connector terminal No. 12 (Green/Brown wire). see scheme 6 If continuity does not exist, go to next step. If continuity exists, repair short to ground in Green/Brown wire between front HO2S connector and ECM connector.
2. Connect front HO2S connector and ECM connector. Start engine and allow it to reach normal operating temperature. With engine idling, backprobe and monitor voltage between front HO2S connector terminal No. 4 (Green/Brown wire) and ground. see scheme 8 Voltage should switch between about 400 millivolts and about 1100 millivolts at least 3 times in 10 seconds. If voltage is not as specified, replace front HO2S. If voltage is as specified, check front HO2S connector and ECM connector for loose, damaged or corroded terminals. If problem exists, repair appropriate connector.

1. Turn ignition off. Disconnect front HO2S 4-pin connector and ECM 88-pin connector. Turn ignition on. Check for voltage between ground and ECM connector terminal No. 12 (Green/Brown wire). see scheme 6 If voltage does not exist, go to next step. If voltage exists, repair short to power in Green/Brown wire between front HO2S and ECM.
2. Turn ignition off. Connect front HO2S connector and ECM connector. Start engine and allow it to reach normal operating temperature. With engine idling, backprobe and monitor voltage between front HO2S connector terminal No. 4 (Green/Brown wire) and ground. see scheme 8 Voltage should switch between about 400 millivolts and 1100 millivolts at least 3 times in 10 seconds. If voltage is not as specified, replace front HO2S. If voltage is as specified, check front HO2S connector and ECM connector for loose, damaged or corroded terminals. If problem exists, repair appropriate connector.

Note. If any misfire, purge solenoid, MAF sensor or HO2S heater codes are present, repair those first.

1. Check front and rear HO2Ss for reversed connections. If problem exists, switch connectors. If problem does not exist, go to next step.
2. Perform fuel pressure test, maximum fuel pressure test and fuel pressure hold test. See appropriate tests under «FUEL PRESSURE»(ref-3154-S24532361192000041800000) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES article. If all fuel pressure tests are within specifications, go to next step. If any fuel pressure test is not within specifications, repair fuel system as necessary.
3. Check for split, disconnected or damaged vacuum hoses. Check PCV valve operation. See «POSITIVE CRANKCASE VENTILATION (PCV)»(ref-3159-S29763870002000041800000) under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. Check Purge Solenoid Valve (PSV) installation and operation. See «PURGE SOLENOID VALVE (PSV)»(ref-3159-S10301750042000041800000) under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If problem exists, replace vacuum hose(s), PCV valve and/or PSV as necessary. If problem does not exist, go to next step.
4. Start engine and allow it to reach normal operating temperature. With engine idling, backprobe and monitor voltage between front HO2S connector terminal No. 4 (Green/Brown wire) and ground. see scheme 8 Voltage should switch between about 400 millivolts and 1100 millivolts at least 3 times in 10 seconds. If voltage is as specified, go to next step. If voltage is not as specified, perform checks in step 5). If no intake leaks are indicated in next step, replace front HO2S. If intake leak is indicated in next step, repair leak as necessary. CAUTION: DO NOT spray carburetor cleaner on or near coils or plug wires. Allow enough time between checking areas for leaks for carburetor spray to dissipate.
5. With engine idling, spray short bursts of aerosol carburetor cleaner in following areas while observing voltage changes at front HO2S connector terminal No. 4 (Green/Brown wire): Throttle body gasket. Gasket between intake manifold and cylinder head. Gasket between intake manifold and surge tank. Seals between intake manifold and fuel injectors. Seal between surge tank and PCV pipe. A rise in voltage that lasts about as long as the duration of carburetor cleaner spray indicates an intake leak. If leak is indicated, repair as necessary. If no leak is indicated, go to next step.
6. With engine idling, have helper hold wadded rag against tailpipe. Listen for exhaust leaks between main catalytic converter and cylinder head. If exhaust leak is detected, repair as necessary. If exhaust leak is not detected, go to next step.
7. With engine idling, backprobe and measure voltage between MAF sensor connector terminal No. 1 (Black/Yellow wire) and ground. see scheme 12 If voltage drop is 35 millivolts or less, clear codes and retest system. If voltage drop is more than 35 millivolts, repair high resistance between MAF sensor connector and ground. Ground point is located behind left side of instrument panel.

Note. If any misfire, purge solenoid, MAF sensor or HO2S heater codes are present, repair those first.

1. Turn ignition off. Check for continuity of FRONT O2 fuse (10-amp). If FRONT O2 fuse is blown, replace fuse and repair short to ground in Pink wire between front HO2S and engine compartment fuse/relay box. If FRONT O2 fuse is okay, go to next step.
2. Disconnect front HO2S 4-pin connector and ECM 88-pin connector. Measure resistance of Green/Blue wire between front HO2S connector terminal No. 2 and ECM connector terminal No. 11. see scheme 6and see scheme 8. Also, measure resistance of Green/Brown wire between front HO2S connector terminal No. 4 and ECM connector terminal No. 12. If each resistance is less than one ohm, go to next step. If either resistance is one ohm or more, repair in open appropriate wire between front HO2S and ECM.
3. Turn ignition on. Measure voltage between ground and front HO2S connector terminal No. 1. If battery voltage exists, go to next step. If battery voltage does not exist, repair open in Pink wire between engine compartment fuse/relay box and front HO2S.
4. Connect front HO2S connector. Ensure scan tool is connected to OBD-II Data Link Connector (OBD-II DLC). Drive vehicle and using scan tool, monitor front HO2S input voltage. Front HO2S should switch from rich to lean at least 3 times each 10 seconds. If front HO2S is switching as specified, check front HO2S connector and ECM connector for loose, damaged or corroded terminals. If problem exists, repair appropriate connector. If front HO2S is not switching as specified, replace front HO2S.

1. Turn ignition off. Check continuity of FRONT O2 fuse (10-amp). If FRONT O2 fuse is blown, replace fuse and repair short to ground in Pink wire between front HO2S and engine compartment fuse/relay box. If FRONT O2 fuse is okay, go to next step.
2. Disconnect front HO2S 4-pin connector and ECM 88-pin connector. Measure resistance of Green/Black wire between front HO2S connector terminal No. 3 and ECM connector terminal No. 37. see scheme 6and see scheme 8. If resistance is less than one ohm, go to next step. If resistance is one ohm or more, repair open in Green/Black wire between front HO2S and ECM.
3. Turn ignition on. Check for voltage between ground and ECM connector terminal No. 37 (Green/Black wire). If voltage exists, repair short to power in Green/Black wire between front HO2S connector and ECM connector. If voltage does not exist, go to next step.
4. Turn ignition off. Measure resistance between front HO2S connector terminals No. 1 and 3 (Pink wire and Green/Black wire - component side). If resistance is 2-4 ohms, check front HO2S connector and ECM connector for loose, damaged and corroded terminals. If problem exists, repair appropriate connector. If resistance is not 2-4 ohms, replace front HO2S.

1. Turn ignition off. Disconnect rear HO2S 4-pin connector. Check for continuity between rear HO2S connector terminals No. 2 and 4 (Violet/White wire and Green/White wire). see scheme 8 If continuity exists, repair short between Violet/White wire and Green/White wire, or short to ground in Green/White wire. If continuity does not exist, go to next step.
2. Connect rear HO2S connector. Start and idle engine. When engine reaches normal operating temperature, backprobe and monitor voltage between rear HO2S connector terminal No. 4 (Green/White wire) and ground. Increase engine speed to 2000-2500 RPM for 5-10 seconds, then release throttle. Repeat several times while monitoring rear HO2S voltage. Rear HO2S voltage should rise during sustained high RPM and drop significantly when throttle is snapped shut. If rear HO2S voltage does not change as specified, replace rear HO2S. If rear HO2S voltage changes as specified, check rear HO2S connector and ECM connector for loose, damaged or corroded terminals. If problem exists, repair appropriate connector.

1. Turn ignition off. Disconnect rear HO2S 4-pin connector. Check for continuity between ground and rear HO2S connector terminal No. 4 (Green/White wire). see scheme 8 If continuity exists, repair short to ground in Green/White wire between rear HO2S and ECM. If continuity does not exist, go to next step.
2. Connect rear HO2S connector. Start and idle engine. When engine reaches normal operating temperature, backprobe and monitor voltage between rear HO2S connector terminal No. 4 (Green/White wire) and ground. Increase engine speed to 2000-2500 RPM for 5-10 seconds, then release throttle. Repeat several times while monitoring rear HO2S voltage. Rear HO2S voltage should rise during sustained high RPM and drop significantly when throttle is snapped shut. If rear HO2S voltage does not change as specified, replace rear HO2S. If rear HO2S voltage changes as specified, check rear HO2S connector and ECM connector for loose, damaged or corroded terminals. If problem exists, repair appropriate connector.

1. Turn ignition off. Disconnect rear HO2S 4-pin connector. Check for voltage between ground and rear HO2S connector terminal No. 4 (Green/White wire). see scheme 8 If voltage does not exist, go to next step. If voltage exists, repair short to power in Green/White wire between rear HO2S and ECM.
2. Connect rear HO2S connector. Start and idle engine. When engine reaches normal operating temperature, backprobe and monitor voltage between rear HO2S connector terminal No. 4 (Green/White wire) and ground. Increase engine speed to 2000-2500 RPM for 5-10 seconds, then release throttle. Repeat several times while monitoring rear HO2S voltage. Rear HO2S voltage should rise during sustained high RPM and drop significantly when throttle is snapped shut. If rear HO2S voltage does not change as specified, replace rear HO2S. If rear HO2S voltage changes as specified, check rear HO2S connector and ECM connector for loose, damaged or corroded terminals. If problem exists, repair appropriate connector.

Note. If any misfire, purge solenoid, MAF sensor or HO2S heater codes are present, repair those first.

1. Check front and rear HO2Ss for reversed connections. If problem exists, switch connectors. If problem does not exist, go to next step.
2. Perform fuel pressure test, maximum fuel pressure test and fuel pressure hold test. See «FUEL PRESSURE (SEPHIA)»(ref-3154-S11720401432000041800000) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES article. If all fuel pressure tests are within specifications, go to next step. If any fuel pressure test is not within specifications, repair fuel system as necessary.
3. Check for split, disconnected or damaged vacuum hoses. Check PCV valve operation. See «POSITIVE CRANKCASE VENTILATION (PCV)»(ref-3159-S29763870002000041800000) under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. Check Purge Solenoid Valve (PSV) installation and operation. See «PURGE SOLENOID VALVE (PSV)»(ref-3159-S10301750042000041800000) under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If problem exists, replace vacuum hose(s), PCV valve and/or PSV as necessary. If problem does not exist, go to next step.
4. Start engine and allow it to reach normal operating temperature. With engine idling, backprobe and monitor voltage between rear HO2S connector terminal No. 4 (Green/White wire) and ground. see scheme 8 Increase engine speed to 2000-2500 RPM for 5-10 seconds, then release throttle. Repeat several times while monitoring rear HO2S voltage. Rear HO2S voltage should rise during sustained high RPM and drop significantly when throttle is snapped shut. If rear HO2S voltage changes as specified, go to next step. If rear HO2S voltage does not change as specified, perform checks listed in step 5). If intake leak is not indicated in next step, replace rear HO2S. If intake leak is indicated in next step, repair leak as necessary. CAUTION: DO NOT spray carburetor cleaner on or near coils or plug wires. Allow enough time between checking areas for carburetor spray to dissipate.
5. With engine idling, spray short bursts of aerosol carburetor cleaner in following areas while observing voltage changes at front HO2S connector terminal No. 4 (Green/Brown wire): Throttle body gasket. Gasket between intake manifold and cylinder head. Gasket between intake manifold and surge tank. Seals between intake manifold and fuel injectors. Seal between surge tank and PCV pipe. A rise in voltage that lasts about as long as duration of carburetor cleaner spray indicates an intake leak. If leak is indicated, repair as necessary. If no leak is indicated, go to next step.
6. With engine idling, have helper hold wadded rag against tailpipe. Listen for exhaust leaks between main catalytic converter and cylinder head. If exhaust leak is detected, repair as necessary. If no exhaust leaks are detected, go to next step.
7. With engine idling, backprobe and measure voltage between MAF sensor connector terminal No. 1 (Black/Yellow wire) and ground. see scheme 12 If voltage drop is 35 millivolts or less, clear codes and retest system. If voltage drop is more than 35 millivolts, repair high resistance between MAF sensor connector and ground. Ground point is located behind left side of instrument panel.

Note. If any misfire, purge solenoid, MAF sensor or HO2S heater codes are present, repair those first.

1. Check continuity of REAR O2 fuse (10-amp). If REAR O2 fuse is blown, replace fuse and repair short to ground in Pink wire between rear HO2S and engine compartment fuse/relay box. If REAR O2 fuse is okay, go to next step.
2. Turn ignition off. Disconnect rear HO2S 4-pin connector and ECM 88-pin connector. Measure resistance of Violet/White wire between rear HO2S connector terminal No. 2 and ECM connector terminal No. 10. see scheme 6and see scheme 8. Also, measure resistance of Green/White wire between rear HO2S connector terminal No. 4 and ECM connector terminal No. 39. If each resistance is less than one ohm, go to next step. If either resistance is one ohm or more, repair open in appropriate wire between rear HO2S and ECM.
3. Connect rear HO2S connector. Start engine and allow it to reach normal operating temperature. With engine idling, backprobe and monitor voltage between rear HO2S connector terminal No. 4 (Green/White wire) and ground. Increase engine speed to 2000-2500 RPM for 5-10 seconds, then release throttle. Repeat several times while monitoring rear HO2S voltage. Rear HO2S voltage should rise during sustained high RPM and drop significantly when throttle is snapped shut. If rear HO2S voltage does not change as specified, replace rear HO2S. If rear HO2S voltage changes as specified, check rear HO2S connector and ECM connector for loose, damaged or corroded terminals. If problem exists, repair appropriate connector.

1. Turn ignition off. Check continuity of REAR O2 fuse (10-amp). If REAR O2 fuse is blown, replace fuse and repair short to ground in Pink wire between rear HO2S and engine compartment fuse/relay box. If REAR O2 fuse is okay, go to next step.
2. Disconnect rear HO2S 4-pin connector and ECM 88-pin connector. Measure resistance of Green/Red wire between rear HO2S connector terminal No. 3 and ECM connector terminal No. 30. see scheme 6and see scheme 8. If resistance is less than one ohm, go to next step. If resistance is one ohm or more, repair open in Green/Red wire between rear HO2S and ECM.
3. Turn ignition on. Check for voltage between ground and ECM connector terminal No. 30 (Green/Red wire). If voltage exists, repair short to power in Green/Red wire between rear HO2S and ECM. If voltage does not exist, go to next step.
4. Turn ignition off. Measure resistance between rear HO2S connector terminals No. 1 and 3 (Pink wire and Green/Red wire - component side). Rear HO2S resistance should be 2-4 ohms at 73°F (23°C). If resistance is not as specified, replace rear HO2S. If resistance is as specified, check ECM connector and rear HO2S connector for loose, damaged or corroded terminals. If problem exists, repair appropriate connector.

Note. If any fuel injector, HO2S, Engine Coolant Temperature (ECT) sensor or Mass Airflow (MAF) sensor codes are present, repair those first. Using scan tool, clear DTCs. Drive vehicle with KIA Data Pro connected to OBD-II Data Link Connector (OBD-II DLC) and monitor for pending codes. If DTC P0171 returns, perform following procedure.

1. Check vacuum hoses for leaks. Check PCV valve operation. Check purge solenoid valve for proper installation and operation. If problem exists, repair as necessary. If problem does not exist, go to next step.
2. Perform fuel pressure test. Perform maximum fuel pressure test. Perform fuel pressure hold test. See appropriate tests under «FUEL SYSTEM»(ref-3154-S19283624802000041800000) in BASIC DIAGNOSTIC PROCEDURES article. If all tests are within specifications, go to next step. If any test is not within specifications, repair fuel system as necessary.
3. Perform fuel injector inspection and volume test. See appropriate test under «FUEL SYSTEM»(ref-3154-S19283624802000041800000) in BASIC DIAGNOSTIC PROCEDURES article. If problem exists, clean or replace fuel injectors as necessary. If problem does not exist, go to next step. CAUTION: DO NOT spray carburetor cleaner on or near coils or plug wires. Allow enough time between checking areas for carburetor spray to dissipate.
4. Start engine and bring to operating temperature. Backprobe and monitor voltage between front HO2S connector terminal No. 4 (Green/Brown wire) and ground. see scheme 8 With engine idling, spray short bursts of aerosol carburetor cleaner in following areas while observing voltage changes: Throttle body gasket. Gasket between intake manifold and cylinder head. Gasket between intake manifold and surge tank. Gasket between intake manifold and cylinder head. Seals between intake manifold and fuel injectors. Seal between surge tank and PCV pipe. A rise in voltage that lasts about as long as duration of carburetor cleaner spray indicates an intake leak. If leak is indicated, repair as necessary. If no leak is indicated, go to next step.
5. With engine idling, have helper hold wadded rag against tailpipe. Listen for exhaust leaks between main catalytic converter and cylinder head. If exhaust leak is detected, repair as necessary. If exhaust leak is not detected, go to next step.
6. Turn ignition off. Check Mass Airflow (MAF) sensor for contamination, deterioration or damage. If problem exists, clean or replace MAF sensor as necessary. If problem does not exist, go to next step.
7. Disconnect TP sensor 3-pin connector. Measure resistance between TP sensor connector terminals No. 2 and 3 (Blue/White wire and Blue/Orange wire - component side) with throttle valve closed and while smoothly opening throttle valve. see scheme 13 When throttle valve is closed, resistance should be 1.6-2.4 k/ohms. As throttle valve is opened, resistance should increase linearly. Replace TP sensor as necessary. If TP sensor is okay, go to next step.
8. Start and idle engine. Backprobe and measure voltage between ECM connector terminal No. 41 (Red/White wire) and ground. see scheme 6 Open throttle slowly and verify voltage increases with air flow. See «MAF SENSOR OUTPUT SPECIFICATIONS»(ref-3156-S26305257132000050200000) table. If voltages are within specifications, go to next step. If voltages are not within specifications, check MAF sensor connector, ECM connector and wiring between MAF sensor and ECM. If problem exists, repair connector or wiring as necessary. If problem does not exist, replace MAF sensor. MAF SENSOR OUTPUT SPECIFICATIONS Engine Speed - RPM (1) MAF Output - Voltage Idle 0.9-1.0 1500 1.2 2000 1.4 2500 1.5-1.6 3000 1.7 (1) Approximate values at sea level and 50 percent relative humidity.
9. Turn ignition off. Disconnect TP sensor 3-pin connector and ECM 88-pin connector. Measure resistance of Black/Green wire between TP sensor connector terminal No. 1 and ECM connector terminal No. 71. see scheme 6and see scheme 13. Also, measure resistance of Blue/White wire between TP sensor connector terminal No. 2 and ECM connector terminal No. 59. And measure resistance of Blue/Orange wire between TP sensor connector terminal No. 3 and ECM connector terminal No. 73. If each resistance is less than one ohm, go to next step. If any resistance is one ohm or more, repair open in appropriate wire between TP sensor and ECM.
10. Disconnect MAF sensor 4-pin connector. Measure resistance of Red/Blue wire between MAF sensor connector terminal No. 2 and ECM connector terminal No. 14. see scheme 6and see scheme 12. Also, measure resistance of Red/White wire between MAF sensor connector terminal No. 4 and ECM connector terminal No. 41. And measure resistance of Black/Yellow wire between MAF sensor connector terminal No. 1 and ground. Ground point is located behind left side of instrument panel. If each resistance is less than one ohm, check TP sensor connector, MAF sensor connector and ECM connector for loose, damaged or corroded terminals. If problem exists, repair appropriate connector. If any resistance is one ohm or more, repair open in appropriate wire between MAF sensor and ECM.

Note. If any fuel injector, HO2S, Engine Coolant Temperature (ECT) sensor or Mass Airflow (MAF) sensor codes are present, repair those first. Using scan tool, clear DTCs. Drive vehicle with KIA Data Pro connected to OBD-II Data Link Connector (OBD-II DLC) and monitor for pending codes. If DTC P0172 returns, perform following procedure.

1. Check spark plugs, plug wires and ignition coil. See «IGNITION CHECKS»(ref-3154-S08672243462000041800000) in BASIC DIAGNOSTIC PROCEDURES article. If problem exists, repair as necessary. If problem does not exist, go to next step.
2. Perform fuel pressure test. Perform maximum fuel pressure test. Perform fuel pressure hold test. See appropriate tests under «FUEL SYSTEM»(ref-3154-S19283624802000041800000) in BASIC DIAGNOSTIC PROCEDURES article. If all tests are within specifications, go to next step. If any test is not within specifications, repair fuel system as necessary.
3. Perform fuel injector inspection and volume test. See appropriate test under «FUEL SYSTEM»(ref-3154-S19283624802000041800000) in BASIC DIAGNOSTIC PROCEDURES article. If problem exists, clean or replace fuel injectors as necessary. If problem does not exist, go to next step.
4. Start engine and bring to operating temperature. Backprobe and monitor voltage between front HO2S connector terminal No. 4 (Green/Brown wire) and ground. see scheme 8 With engine idling, front HO2S voltage should switch from rich to lean a minimum of 3 times in 10 seconds. If front HO2S voltage switches as specified, go to next step. If front HO2S voltage does not switch as specified, replace front HO2S.
5. Turn ignition off. Check Mass Airflow (MAF) sensor for contamination, deterioration or damage. If problem exists, clean or replace MAF sensor as necessary. If problem does not exist, go to next step.
6. Disconnect TP sensor 3-pin connector. Measure resistance between TP sensor connector terminals No. 2 and 3 (Blue/White wire and Blue/Orange wire - component side) with throttle valve closed and while smoothly opening throttle valve. see scheme 13 When throttle valve is closed, resistance should be 1.6-2.4 k/ohms. As throttle valve is opened, resistance should increase linearly. Replace TP sensor as necessary. If TP sensor is okay, go to next step.
7. Start and idle engine. Backprobe and measure voltage between ECM connector terminal No. 41 (Red/White wire) and ground. see scheme 6 Open throttle slowly and verify voltage increases with air flow. See «MAF SENSOR OUTPUT SPECIFICATIONS»(ref-3156-S26305257132000050200000) table. If voltages are within specifications, go to next step. If voltages are not within specifications, check MAF sensor connector, ECM connector and wiring between MAF sensor and ECM. If connectors and wiring are okay, replace MAF sensor.
8. Turn ignition off. Disconnect TP sensor 3-pin connector and ECM 88-pin connector. Measure resistance of Black/Green wire between TP sensor connector terminal No. 1 and ECM connector terminal No. 71. see scheme 6and see scheme 13. Also, measure resistance of Blue/White wire between TP sensor connector terminal No. 2 and ECM connector terminal No. 59. And measure resistance of Blue/Orange wire between TP sensor connector terminal No. 3 and ECM connector terminal No. 73. If each resistance is less than one ohm, go to next step. If any resistance is one ohm or more, repair open in appropriate wire between TP sensor and ECM.
9. Disconnect MAF sensor 4-pin connector. Measure resistance of Red/Blue wire between MAF sensor connector terminal No. 2 and ECM connector terminal No. 14. see scheme 6and see scheme 12. Also, measure resistance of Red/White wire between MAF sensor connector terminal No. 4 and ECM connector terminal No. 41. And measure resistance of Black/Yellow wire between ground and MAF sensor connector terminal No. 1. Ground point is located behind left side of instrument panel. If each resistance is less than one ohm, check TP sensor connector, MAF sensor connector and ECM connector for loose, damaged or corroded terminals. If problem exists, repair appropriate connector. If any resistance is one ohm or more, repair open in appropriate wire between MAF sensor and ECM.

1. Remove INJ fuse (10-amp) from engine compartment fuse/relay box. Check continuity of fuse. If fuse is okay, install fuse and go to next step. If fuse is blown, replace fuse and retest system.
2. Turn ignition off. Disconnect fuel injector 2-pin connector from appropriate fuel injector. Turn ignition on. Measure voltage between ground and appropriate fuel injector connector terminal No. 1 (Red/Yellow wire). If battery voltage exists, go to next step. If battery voltage does not exist, repair open in Red/Yellow wire between INJ fuse (10-amp) in engine compartment fuse/relay box and fuel injector.
3. Turn ignition off. Disconnect ECM 88-pin connector. Measure resistance of wire between appropriate fuel injector and corresponding ECM connector terminal. See «IDENTIFYING FUEL INJECTOR-TO-ECM CIRCUIT»(ref-3156-S27221152432000050200000) table. see scheme 6 If resistance is less than one ohm, go to next step. If resistance is one ohm or more, repair open in wire between fuel injector and ECM. IDENTIFYING FUEL INJECTOR-TO-ECM CIRCUIT Injector No. Color of Wire Between Injector & ECM ECM Connector Terminal No. 1 Brown/Black 3 2 Brown/Green 32 3 Brown/Black 31 4 Brown/Yellow 4
4. Check for continuity between ground and ECM connector terminal used in previous step. If no continuity exists, go to next step. If continuity exists, repair short to ground in wire between fuel injector and ECM.
5. Turn ignition on. Measure voltage between ground and ECM connector terminal used in previous step. If no voltage exists, go to next step. If voltage exists, repair short to power in wire between appropriate fuel injector and ECM.
6. Measure resistance between fuel injector connector terminals (component side). Resistance should be 14-15 ohms at 68°F (20°C). If resistance is not as specified, replace fuel injector. If resistance is as specified, check fuel injector connector, ECM connector and engine compartment fuse/relay box connector terminals for loose, damaged or corroded terminals. If problem exists, repair appropriate connector.

1. Turn ignition off. Disconnect fuel injector No. 1 connector. Turn ignition on. Measure voltage between ground and fuel injector No. 1 connector terminal No. 1 (Red/Yellow wire). If battery voltage exists, go to next step. If battery voltage does not exist, repair open or short to ground in Red/Yellow wire between EGI main relay and fuel injector.
2. Turn ignition off. Disconnect ECM 88-pin connector. Measure resistance of Brown/Black wire between fuel injector No. 1 connector terminal No. 2 and ECM connector terminal No. 3. see scheme 6 If resistance is less than one ohm, go to next step. If resistance is one ohm or more, repair open in Brown/Black wire between fuel injector and ECM.
3. Check for continuity between ground and fuel injector No. 1 connector terminal No. 2 (Brown/Black wire). If continuity exists, repair short to ground in Brown/Black wire between fuel injector and ECM. If continuity does not exist, go to next step.
4. Measure resistance between fuel injector No. 1 connector terminals (component side). Fuel injector resistance should be 14-15 ohms at 68°F (20°C). If resistance is not as specified, replace fuel injector. If resistance is as specified, check fuel injector connector, ECM connector and engine compartment fuse/relay box connector for loose, damaged or corroded terminals. If problem exists, repair appropriate connector.

1. Turn ignition off. Disconnect fuel injector No. 1 connector and ECM 88-pin connector. Turn ignition on. Measure voltage between ground and ECM connector terminal No. 3 (Brown/Black wire). see scheme 6 If voltage exists, repair short to power in Brown/Black wire between fuel injector No. 1 and ECM connector terminal No. 3. If voltage does not exist, go to next step.
2. Measure resistance between fuel injector No. 1 connector terminals (component side). Fuel injector resistance should be 14-15 ohms at 68°F (20°C). If resistance is not as specified, replace fuel injector. If resistance is as specified, wiggle wiring between fuel injector and ECM while performing step 1) again. If source of intermittent is located, repair wiring as necessary.

1. Turn ignition off. Disconnect fuel injector No. 2 connector. Turn ignition on. Measure voltage between ground and fuel injector No. 2 connector terminal No. 1 (Red/Yellow wire). If battery voltage exists, go to next step. If battery voltage does not exist, repair open or short to ground in Red/Yellow wire between EGI main relay and fuel injector.
2. Turn ignition off. Disconnect ECM 88-pin connector. Measure resistance of Brown/Green wire between fuel injector No. 2 connector terminal No. 2 and ECM connector terminal No. 32. see scheme 6 If resistance is less than one ohm, go to next step. If resistance is one ohm or more, repair open in Brown/Green wire between fuel injector and ECM.
3. Check for continuity between ground and fuel injector No. 2 connector terminal No. 2 (Brown/Green wire). If continuity exists, repair short to ground in Brown/Green wire between fuel injector and ECM. If continuity does not exist, go to next step.
4. Measure resistance between fuel injector No. 2 connector terminals (component side). Fuel injector resistance should be 14-15 ohms at 68°F (20°C). If resistance is not as specified, replace fuel injector. If resistance is as specified, check fuel injector connector, ECM connector and engine compartment fuse/relay box connector for loose, damaged or corroded terminals. If problem exists, repair appropriate connector.

1. Turn ignition off. Disconnect fuel injector No. 2 connector and ECM 88-pin connector. Turn ignition on. Measure voltage between ground and ECM connector terminal No. 32 (Brown/Green wire). see scheme 6 If voltage exists, repair short to power in Brown/Green wire between fuel injector No. 2 and ECM connector terminal No. 32. If voltage does not exist, go to next step.
2. Measure resistance between fuel injector No. 2 connector terminals (component side). Fuel injector resistance should be 14-15 ohms at 68°F (20°C). If resistance is not as specified, replace fuel injector. If resistance is as specified, wiggle wiring between fuel injector and ECM while performing step 1) again. If source of intermittent is located, repair wiring as necessary.

1. Turn ignition off. Disconnect fuel injector No. 3 connector. Turn ignition on. Measure voltage between ground and fuel injector No. 3 connector terminal No. 1 (Red/Yellow wire). If battery voltage exists, go to next step. If battery voltage does not exist, repair open or short to ground in Red/Yellow wire between EGI main relay and fuel injector.
2. Turn ignition off. Disconnect ECM 88-pin connector. Measure resistance of Brown/Black wire between fuel injector No. 3 connector terminal No. 2 and ECM connector terminal No. 31. see scheme 6 If resistance is less than one ohm, go to next step. If resistance is one ohm or more, repair open in Brown/Black wire between fuel injector and ECM.
3. Check for continuity between ground and fuel injector No. 3 connector terminal No. 2 (Brown/Black wire). If continuity exists, repair short to ground in Brown/Black wire between fuel injector and ECM. If continuity does not exist, go to next step.
4. Measure resistance between fuel injector No. 1 connector terminals (component side). Fuel injector resistance should be 14-15 ohms at 68°F (20°C). If resistance is not as specified, replace fuel injector. If resistance is as specified, check fuel injector connector, ECM connector and engine compartment fuse/relay box connector for loose, damaged or corroded terminals. If problem exists, repair appropriate connector.

1. Turn ignition off. Disconnect fuel injector No. 3 connector and ECM 88-pin connector. Turn ignition on. Measure voltage between ground and ECM connector terminal No. 31 (Brown/Black wire). see scheme 6 If voltage exists, repair short to power in Brown/Black wire between fuel injector No. 3 and ECM connector terminal No. 31. If voltage does not exist, go to next step.
2. Measure resistance between fuel injector No. 3 connector terminals (component side). Fuel injector resistance should be 14-15 ohms at 68°F (20°C). If resistance is not as specified, replace fuel injector. If resistance is as specified, wiggle wiring between fuel injector and ECM while performing step 1) again. If source of intermittent is located, repair wiring as necessary.

1. Turn ignition off. Disconnect fuel injector No. 4 connector. Turn ignition on. Measure voltage between ground and fuel injector No. 4 connector terminal No. 1 (Red/Yellow wire). If battery voltage exists, go to next step. If battery voltage does not exist, repair open or short to ground in Red/Yellow wire between EGI main relay and fuel injector.
2. Turn ignition off. Disconnect ECM 88-pin connector. Measure resistance of Brown/Yellow wire between fuel injector No. 4 connector terminal No. 2 and ECM connector terminal No. 4. see scheme 6 If resistance is less than one ohm, go to next step. If resistance is one ohm or more, repair open in Brown/Yellow wire between fuel injector and ECM.
3. Check for continuity between ground and fuel injector No. 4 connector terminal No. 2 (Brown/Yellow wire). If continuity exists, repair short to ground in Brown/Yellow wire between fuel injector and ECM. If continuity does not exist, go to next step.
4. Measure resistance between fuel injector No. 4 connector terminals (component side). Fuel injector resistance should be 14-15 ohms at 68°F (20°C). If resistance is not as specified, replace fuel injector. If resistance is as specified, check fuel injector connector, ECM connector and engine compartment fuse/relay box connector for loose, damaged or corroded terminals. If problem exists, repair appropriate connector.

1. Turn ignition off. Disconnect fuel injector No. 4 connector and ECM 88-pin connector. Turn ignition on. Measure voltage between ground and ECM connector terminal No. 4 (Brown/Yellow wire). see scheme 6 If voltage exists, repair short to power in Brown/Yellow wire between fuel injector No. 4 and ECM connector terminal No. 4. If voltage does not exist, go to next step.
2. Measure resistance between fuel injector No. 4 connector terminals (component side). Fuel injector resistance should be 14-15 ohms at 68°F (20°C). If resistance is not as specified, replace fuel injector. If resistance is as specified, wiggle wiring between fuel injector and ECM while performing step 1) again. If source of intermittent is located, repair wiring as necessary.

Note. If any fuel injector codes, or pending codes, are present, repair those codes first.

1. Check vacuum hoses for leaks. Check PCV valve operation. See «POSITIVE CRANKCASE VENTILATION (PCV)»(ref-3159-S29763870002000041800000) under EMISSIONS SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. Check purge solenoid valve for proper installation and operation. See «PURGE SOLENOID VALVE (PSV)»(ref-3159-S10301750042000041800000) under EMISSIONS SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If problem exists, repair as necessary. If problem does not exist, go to next step.
2. Disconnect CKP sensor 3-pin connector. Measure resistance between CKP sensor connector terminals No. 1 and No. 2 (White/Yellow wire and White/Green wire - component side). see scheme 2 Resistance should be 800-900 ohms at 68°F (20°C). If resistance is as specified, go to next step. If resistance is not as specified, replace CKP sensor.
3. Remove CKP sensor from transaxle and calculate air gap between sensor and flywheel. Measure distance from transaxle housing to teeth on flywheel (measurement "A"). Measure distance from mounting surface on CKP sensor to CKP sensor tip (measurement "B"). Subtract measurement "B" from measurement "A" to get air gap. Air gap should be.037-.067" (.95-1.70 mm). If air gap is not as specified, repair as necessary. If air gap is as specified, check for loose, damaged or corroded terminals at CKP sensor and ECM. If problem exists, repair appropriate connector. If problem does not exist, go to next step.
4. Turn ignition off. Disconnect ignition coils connector. Turn ignition on. Measure voltage between ground and ignition coils connector terminals No. 1 and 2 (both Yellow wires). If battery voltage exists at each terminal, go to next step. If battery voltage does not exist at either terminal, repair open in appropriate Yellow wire(s) between ignition coil and engine compartment fuse/relay box.
5. Visually inspect ignition coils and plug wires for cracks or carbon tracing. Check resistance of coil primary and secondary coils. Primary coil resistance should be 450-550 milliohms at 68°F (20°C). Secondary coil resistance should be 13-15 k/ohms at 68°F (20°C). Check resistance of plug wires. Plug wire resistance should be 16 k/ohms per 3.28 ft (meter). If any part does not pass visual inspection or resistance test, replace parts. If all parts pass visual inspection and resistance tests, go to next step.
6. Remove spark plugs. Check condition and gap of spark plugs. Spark plug gaps should be.027-.031" (.7-.8 mm). If problem exists, replace spark plugs as necessary. If problem does not exist, go to next step.
7. Perform compression test. Compression should be about 193 psi at 300 RPM with no more than 10 percent variation between highest and lowest cylinders. If compression test is within specifications, go to next step. If compression test is not within specifications, perform leak down test to determine source of low compression and repair as necessary.
8. Backprobe and monitor voltage between front Heated Oxygen Sensor (HO2S) connector terminal No. 4 (Green/Brown wire) and ground. see scheme 8 Start engine and allow it to reach normal operating temperature. With engine idling, spray short spurts of aerosol carburetor cleaner into following areas while observing voltage changes: Throttle body gasket. Gasket between intake manifold and cylinder head. Gasket between intake manifold and surge tank. Seals between intake manifold and fuel injectors. Seal between surge tank and PCV pipe. A long rise in voltage that corresponds to approximate timing and duration of spray of carburetor cleaner indicates air leak in area sprayed. If leak is indicated, repair as necessary. If no leak is indicated, go to next step.
9. Release fuel pressure. Connect fuel pressure gauge to service port on fuel rail. With engine at normal operating temperature, check fuel pressure at idle. If fuel pressure is 46-51 psi (320-350 kPa) go to step 11. If fuel pressure is less than 46 psi (320 kPa), pinch off fuel return hose. If fuel pressure increases, replace fuel pressure regulator. If fuel pressure does not increase, check fuel filter for restriction. If fuel filter is okay, go to next step.
10. Check fuel pump maximum pressure. See «MAXIMUM FUEL PRESSURE (SEPHIA)»(ref-3154-S16632556232000041800000) test under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES article. If fuel pressure is less than specification, replace fuel pump or fuel pump filter as necessary. If fuel pressure is more than 51 psi (350 kPa), remove return hose from fuel filter and check for restrictions. If hose is not restricted, replace fuel pressure regulator. If line is restricted, repair as necessary.
11. Perform fuel injector inspection and volume test. See «FUEL INJECTORS»(ref-3154-S42560300842000041800000) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES article. If any fuel injector is not operating or dispensing fuel properly, repair as necessary. If fuel injectors are operating and dispensing fuel okay, check all connectors in related circuits for loose, damaged or corroded terminals. If problem exists, repair appropriate connector.

1. Turn ignition off. Disconnect ECM 88-pin connector. Check for continuity between ECM connector terminals No. 70 and 71 (Yellow/Blue wire and Black/Green wire). see scheme 6 If continuity does not exist, go next step. If continuity exists, go to step 3.
2. Check for continuity between ground and ECM connector terminal No. 70 (Yellow/Blue wire). Also, check for continuity between ground and ECM connector terminal No. 71 (Black/Green wire). Continuity should not exist between ground and either wire. If continuity does not exist between ground and either wire, go to step 4. If continuity exists between ground and either wire, repair short to ground in appropriate wire between knock sensor and ECM.
3. Disconnect knock sensor 3-pin connector. Check for continuity between ECM connector terminals No. 70 and 71 (Yellow/Blue wire and Black/Green wire). If continuity does not exist, go to next step. If continuity exists, repair short between knock sensor wires.
4. Disconnect knock sensor 3-pin connector. Measure resistance of Yellow/Blue wire between ECM connector terminal No. 70 and knock sensor connector terminal No. 1. Also, measure resistance of Black/Green wire between ECM connector terminal No. 71 and knock sensor connector terminal No. 2. And measure resistance of Black/Yellow wire between ground and knock sensor connector terminal No. 3. If each resistance is less than one ohm, go to next step. If any resistance is one ohm or more, repair open in appropriate wire between knock sensor and ECM or ground. Ground point is located behind left side of instrument panel.
5. Connect ECM connector and knock sensor connector. Turn ignition on. Backprobe and measure voltage between knock sensor connector terminal No. 1 (Yellow/Blue wire) and ground. Tap on engine with wrench. Voltage spike of less than one volt should be output from knock sensor when engine is tapped on. If problem exists, replace knock sensor.

1. Turn ignition off. Disconnect CKP sensor 3-pin connector and ECM 88-pin connector. Measure resistance of White/Yellow wire between CKP sensor connector terminal No. 1 and ECM connector terminal No. 16. see scheme 2and see scheme 6. If resistance is less than one ohm, go to next step. If resistance is one ohm or more, repair open in White/Yellow wire between CKP sensor and ECM.
2. Measure resistance of White/Green wire between CKP sensor connector terminal No. 2 and ECM connector terminal No. 43. If resistance is less than one ohm, go to next step. If resistance is one ohm or more, repair open in White/Green wire between CKP sensor and ECM.
3. Check for continuity between ECM connector terminals No. 16 and 43 (White/Yellow wire and White/Green wire). If continuity does not exist, go to next step. If continuity exists, repair short between CKP sensor wires.
4. Turn ignition on. Measure voltage between ground and ECM connector terminal No. 16 (White/Yellow wire). Also, measure voltage between ground and ECM connector terminal No. 43. If voltage does not exist at either terminal, go to next step. If voltage exists at either terminal, repair short to power in appropriate wire between CKP sensor and ECM.
5. Turn ignition off. Connect CKP sensor connector. Measure resistance between ECM connector terminals No. 16 and 43 (White/Yellow wire and White/Green wire). see scheme 6 Resistance should be 800-900 ohms at 68°F (20°C). If resistance is as specified, go to next step. If resistance is not as specified, replace CKP sensor.
6. Remove CKP sensor from transaxle and calculate air gap between sensor and flywheel. Measure distance from transaxle housing to teeth on flywheel (measurement "A"). Measure distance from mounting surface on CKP sensor to CKP sensor tip (measurement "B"). Subtract measurement "B" from measurement "A" to get air gap. Air gap should be.037-.067" (.95-1.70 mm). If air gap is not as specified, repair as necessary. If air gap is as specified, check for loose, damaged or corroded terminals at CKP sensor and ECM. If problem exists, repair as necessary. If problem does not exist, go to next step. NOTE: DO NOT use OBD-II Data Link Connector (OBD-II DLC) for lab scope power source as this will affect waveform.
7. Install CKP sensor and connect CKP sensor connector. Connect ECM connector. Connect lab scope positive probe to ECM connector terminal No. 16 (White/Yellow wire). Connect lab scope negative probe to ECM connector terminal No. 43 (White/Green wire). see scheme 6 Start engine and warm up to normal operating temperature. Allow engine to idle and observe CKP waveform. Compare to normal waveform. (Scheme 26) If CKP sensor waveform is erratic, replace CKP sensor. If waveform is okay, wiggle wiring harness while observing waveform. If waveform becomes erratic while wiggling harness, repair wiring harness as necessary.

Scheme 26

1. Turn ignition off. Disconnect CKP 3-pin connector and ECM 88-pin connector. Measure resistance of White/Yellow wire between CKP sensor connector terminal No. 1 and ECM connector terminal No. 16. see scheme 2and see scheme 6. Also, measure resistance of White/Green wire between CKP sensor connector terminal No. 2 and ECM connector terminal No. 43. If resistance is less than one ohm, go to next step. If resistance is one ohm or more, repair open between CKP sensor connector and ECM connector.
2. Connect CKP sensor connector. Measure resistance between ECM connector terminals No. 16 and 43 (White/Yellow wire and White/Green wire). Resistance should be 800-900 ohms at 68°F (20°C). If resistance is as specified, go to next step. If resistance is not as specified, check CKP sensor connector and ECM connector. If problem exists, repair appropriate connector. If problem does not exist, replace CKP sensor.
3. Remove CKP sensor from transaxle and calculate air gap between sensor and flywheel. Measure distance from transaxle housing to teeth on flywheel (measurement "A"). Measure distance from mounting surface on CKP sensor to CKP sensor tip (measurement "B"). Subtract measurement "B" from measurement "A" to get air gap. Air gap should be.037-.067" (.95-1.70 mm). If air gap is not as specified, repair as necessary. If air gap is as specified, check for loose, damaged or corroded terminals at CKP sensor connector and ECM connector. Also, inspect flywheel/torque converter sensor ring teeth. Ensure all teeth are intact and ring is properly positioned. If problem exists, repair as necessary. If problem does not exist, go to next step. NOTE: DO NOT use OBD-II Data Link Connector (OBD-II DLC) for lab scope power source as this will affect waveform.
4. Connect lab scope positive probe to ECM connector terminal No. 16 (White/Yellow wire). Connect lab scope negative probe to ECM connector terminal No. 43 (White/Green wire). see scheme 6 Set lab scope time to 50 milliseconds and voltage to 5 volts. Start engine and warm up to normal operating temperature. Allow engine to idle and compare CKP sensor waveform to normal CKP sensor waveform. (Scheme 26) If waveform is erratic, replace CKP sensor. If waveform is okay, wiggle wiring harness between CKP sensor and ECM while observing waveform. If waveform becomes erratic while wiggling harness, repair wiring harness as necessary.

1. Turn ignition off. Disconnect CMP sensor 3-pin connector and ECM 88-pin connector. Check for continuity between ground and CMP sensor terminal No. 2 (Blue/Red wire). see scheme 3 If continuity exists, repair short to ground in Blue/Red wire between CMP sensor connector terminal No. 2 and ECM connector terminal No. 44. see scheme 6 If continuity does not exist, go to next step.
2. Check for continuity between ground and CMP sensor connector terminal No. 2 (Blue/Red wire - component side). If continuity exists, replace CMP sensor. If continuity does not exist, go to next step. NOTE: DO NOT use OBD-II Data Link Connector (OBD-II DLC) for lab scope power source as this will affect waveform.
3. Connect lab scope positive probe to ECM connector terminal No. 44 (Blue/Red wire). see scheme 6 Connect lab scope negative probe to ground. Set lab scope time to 50 milliseconds and voltage to 5 volts. Start engine and warm up to normal operating temperature. Allow engine to idle and compare CMP sensor waveform to normal CMP sensor waveform. (Scheme 27) If waveform is erratic, replace CMP sensor. If waveform is okay, wiggle wiring harness between ECM and CMP sensor while observing waveform. If waveform becomes erratic while wiggling harness, repair wiring harness as necessary.

Scheme 27

1. Turn ignition off. Disconnect CMP sensor 3-pin connector and ECM 88-pin connector. Measure resistance of Blue/Red wire between CMP sensor connector terminal No. 2 and ECM connector terminal No. 44. see scheme 3and see scheme 6. If resistance is less than one ohm, go to next step. If resistance is one ohm or more, repair open in Blue/Red wire between CMP sensor and ECM.
2. Measure resistance between ground and CMP sensor connector terminal No. 3 (Black/Yellow wire). If resistance is less than one ohm, go to next step. If resistance is one ohm or more, repair open in Black/Yellow wire between CMP sensor and ground. Ground point is located behind left side of instrument panel.
3. Turn ignition on. Measure voltage between ground and ECM connector terminal No. 44 (Blue/Red wire). If voltage exists, repair short to power in Blue/Red wire between CMP sensor and ECM. If voltage does not exist, go to next step.
4. Turn ignition off. Connect ECM connector. Turn ignition on. Measure voltage between ground and CMP sensor connector terminal No. 1 (Red/Yellow wire). If battery voltage exists, go to step 6. If battery voltage does not exist, go to next step.
5. Check continuity of INJ fuse (10-amp). If fuse is blown, replace fuse. If fuse is okay, check for voltage at engine compartment fuse/relay box Black connector C192 terminal No. 16 (Red/Yellow wire). see scheme 5 If battery voltage exists, repair open in Red/Yellow wire between engine compartment fuse/relay box and CMP sensor. If battery voltage does not exist, replace engine compartment fuse/relay box. NOTE: DO NOT use OBD-II Data Link Connector (OBD-II DLC) for lab scope power source as this will affect waveform.
6. Connect CMP sensor connector. Connect lab scope positive probe to ECM connector terminal No. 44 (Blue/Red wire). see scheme 6 Connect lab scope negative probe to ground. Set lab scope time to 50 milliseconds and voltage to 5 volts. Start engine and warm up to normal operating temperature. Allow engine to idle and compare CMP sensor waveform to normal CMP sensor waveform. (Scheme 27) If waveform is erratic, go to next step. If waveform is okay, wiggle wiring harness between ECM and CMP sensor while observing waveform. If waveform becomes broken or is eliminated while wiggling harness, repair wiring harness as necessary.
7. Turn ignition off. Remove CMP sensor mounting bracket. Check exhaust cam for sensor pin. If sensor pin is present, replace CMP sensor. If sensor pin is missing, replace exhaust cam.

Note. Indication of a good catalytic converter is front HO2S output voltage switches normally while rear HO2S output remains fairly flat. Indication of a weak catalytic converter is front HO2S output voltage switches normally and rear HO2S output voltage pattern is a lower amplitude imitation of the front HO2S.

Note. If any HO2S, fuel system or Evaporative Emissions (EVAP) system DTCs are present, repair those first.

1. Perform fuel pressure test, maximum fuel pressure test and fuel pressure hold test. See appropriate tests in «FUEL PRESSURE»(ref-3154-S24532361192000041800000) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES article. If fuel pressure tests are within specifications, go to next step. If any fuel pressure test is not within specification, repair fuel system as necessary.
2. Perform fuel injector inspection and volume test. See «FUEL INJECTORS»(ref-3154-S42560300842000041800000) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES article. If all fuel injectors are operating properly, go to next step. If any fuel injector is not operating properly, repair appropriate fuel injector.
3. Check vacuum hoses for leaks. Check PCV valve operation. See «POSITIVE CRANKCASE VENTILATION (PCV)»(ref-3159-S29763870002000041800000) under EMISSIONS SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. Check purge solenoid valve for proper installation and operation. See «PURGE SOLENOID VALVE (PSV)»(ref-3159-S10301750042000041800000) under EMISSIONS SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If problem exists, repair as necessary. If problem does not exist, go to next step.
4. Backprobe and monitor voltage between front HO2S connector terminal No. 4 (Green/Brown wire) and ground. see scheme 8 Start engine and allow it to warm-up to normal operating temperature. With engine idling, spray short spurts of aerosol carburetor cleaner into following areas while observing voltage changes: Throttle body gasket. Gasket between intake manifold and cylinder head. Gasket between intake manifold and surge tank. Seals between intake manifold and fuel injectors. Seal between surge tank and PCV pipe. A long rise in voltage that corresponds to approximate timing and duration of spray of carburetor cleaner indicates air leak in area sprayed. If leak is indicated, repair leak as necessary. If no leak is indicated, go to next step.
5. With engine idling, have helper hold wadded rag against tailpipe. Listen for exhaust leaks between main catalytic converter and cylinder head. If exhaust leak is detected, repair as necessary.

Note. If any DTCs related to FTPS, CCV or PSV circuits are present, repair those first. Using scan tool, clear DTCs. Drive vehicle with KIA Data Pro connected to OBD-II Data Link Connector (OBD-II DLC) and monitor for pending codes. If DTC P0440 returns, perform following procedure.

Scheme 28

Scheme 29

1. Check fuel filler cap for correct installation and presence of good, correctly installed "O" ring. Test fuel filler cap. It should vent at about 2 psi pressure and about 1.5 In. Hg vacuum. If fuel filler cap fails test, replace fuel filler cap. If fuel filler cap passes test, go to next step.
2. Check fuel filler pipe for cracks, damage and "O" ring seat deformation. If problem exists, replace fuel filler pipe. If fuel filler pipe is okay, go to next step.
3. Check all fuel vapor hoses and hose clamps between: EVAP canister and rollover/ORVR valves. EVAP canister and CCV. EVAP canister and PSV. PSV and intake manifold. Also ensure arrow on PSV is pointing towards intake manifold. If problem exists, repair as necessary. If problem does not exist, go to next step.
4. Remove fuel filler cap to vent tank. Turn ignition on. Backprobe and measure FTPS output voltage at ECM connector terminal No. 76 (Light Green/Yellow wire). see scheme 6 Voltage should be 2.18-2.82 volts. If voltage is as specified, go to next step. If voltage is not as specified, replace FTPS.
5. Turn ignition off. Reinstall fuel filler cap and tighten. Remove PSV. PSV should be closed. Blow air into port "A". Air should not escape from port "B". (Scheme 28) Open PSV by jumpering one PSV terminal to battery positive terminal. Jumper other PSV terminal to battery negative terminal. Blow air into port "A". Air should escape from port "B". Repeat procedure 4-5 times to ensure reliability of results. If PSV is operating reliably as specified, go to next step. If PSV is not operating as specified, or operation is not reliable, replace PSV, then go to next step.
6. Restore PSV electrical and vacuum connections. Remove CCV. CCV should be open. Blow air into port "A". Air should escape from port "B". (Scheme 29) Close CCV by jumpering one CCV terminal to battery positive terminal. Jumper other CCV terminal to battery negative terminal. Blow air into port "A". Air should not escape from port "B". Repeat procedure 4-5 times to ensure reliability of results. If CCV is operating reliably as specified, go to next step. If CCV is not operating as specified, or operation is not reliable, replace CCV, then go to next step.
7. Restore CCV electrical and vacuum connections. Insert "T" fitting in EVAP hose between PSV and catch tank. Connect hand pressure pump to "T" fitting. Ensure fuel filler cap is installed and tight. Backprobe and connect jumper wire between ground and ECM connector terminal No. 18 (Red/Yellow wire). see scheme 6 Backprobe and connect positive lead of DVOM to ECM connector terminal No. 76 (Light Green/Yellow wire). Connect negative lead of DVOM to ground. Turn ignition on. Using hand pressure pump, apply pressure to system until DVOM (FTPS output voltage) reads about 4 volts. If voltage increases to about 4 volts, go to step 9. If voltage does not increase to 4 volts, go to next step.
8. Remove small hose from "T" fitting in line between EVAP canister and ORVR. If pressure releases, replace FTPS. If pressure does not release, check lines between PSV and fuel tank for clogging. If clogging is found, repair or replace clogged section of line. If clogging is not found, check for fuel in EVAP canister. If fuel is found in EVAP canister, check for stuck closed CCV, faulty rollover valve or faulty ORVR. If problem exists, repair as necessary. If problem does not exist, go to next step.
9. Clamp off hose between hand pressure pump and "T" fitting. Monitor FTPS output voltage for one minute. After one minute, voltage drop should be 100 millivolts or less. If voltage drop is within specifications, go to step 11. If voltage drop is not within specifications, go to next step.
10. Remove clamp from hose between hand pressure pump and "T" fitting. Pressurize system to maximum 2 psi and clamp off hose again. Locate leaks with R-134a leak detector and repair as necessary.
11. Remove jumper wire between ground and ECM connector terminal No. 18 (Red/Yellow wire). FTPS output voltage should drop within 15 seconds to base voltage read in step 4). If voltage drops as specified, go to next step. If voltage does not drop as specified, recheck EVAP lines, catch tank, CCV and EVAP canister for obstructions. When obstruction is located, repair as necessary and repeat steps 7) and 11).
12. Connect jumper wire between ground and ECM connector terminal No. 18 (Red/Yellow wire). Apply pressure until DVOM (FTPS output voltage) reads about 4 volts. Backprobe and connect jumper wire between ECM connector terminal No. 36 (White/Black wire) and ground. FTPS output voltage should drop within 30 seconds to base voltage read in step 4). If voltage drops as specified, go to next step. If voltage does not drop as specified, recheck PSV operation and check EVAP canister and catch tank for obstructions. Repair as necessary and repeat step 12).
13. Clear codes. Perform Readiness Drive Cycle. See READINESS DRIVE CYCLE under SELF-DIAGNOSTIC SYSTEM in «INTRODUCTION»(ref-3155-S41189025172000041800000) article. Ensure engine coolant temperature is less than 150°F (65.5°C) before starting drive cycle. After completing test, check for any pending codes.

1. Disconnect PSV 2-pin connector. Turn ignition on. Measure voltage between ground and PSV connector terminal No. 1 (color not available). If battery voltage exists, go to next step. If battery voltage does not exist, check INJ fuse (10-amp). If fuse is blown, locate and repair short, then replace fuse. If fuse is okay, repair open in wire between PSV and engine compartment fuse/relay box.
2. Turn ignition off. Measure resistance between PSV connector terminals (component side). Resistance should be 24-28 ohms at 68°F (20°C). If resistance is as specified, go to next step. If resistance is not as specified, replace PSV.
3. Disconnect ECM 88-pin connector. Measure resistance of White/Black wire between PSV connector terminal No. 2 and ECM connector terminal No. 36. see scheme 6 If resistance is less than one ohm, go to next step. If resistance is one ohm or more, repair open in White/Black wire between PSV and ECM.
4. Check for continuity between ground and ECM connector terminal No. 36 (White/Black wire). If there is no continuity, go to next step. If there is continuity, repair short to ground in White/Black wire between PSV and ECM.
5. Turn ignition on. Measure voltage between ground and ECM connector terminal No. 36 (White/Black wire). If voltage exists, repair short to power in White/Black wire between PSV and ECM. If voltage does not exist, check connectors for loose, damaged or corroded terminals. If problem exists, appropriate connector.

1. Turn ignition switch to ON position. Using voltmeter, measure voltage between ground and fuel tank unit harness connector C305 terminal No. 3 (Red/Yellow wire). See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. If greater than zero volts is indicated, go to next step. If zero volts is indicated, repair short to ground in Red/Yellow wire between ECM harness connector C254 terminal No. 18 and fuel tank unit harness connector C305 terminal No. 3.
2. Turn ignition switch to OFF position. Disconnect fuel tank unit harness connector C305 and ECM harness connector C254. Using ohmmeter, measure resistance of Red/Yellow wire between ECM harness connector C254 terminal No. 18 and fuel tank unit harness connector C305 terminal No. 3. Zero ohms should exist. If resistance is as specified, go to next step. If resistance is greater than specified, repair open in Red/Yellow wire.
3. Turn ignition switch to ON position with engine not running. Using voltmeter, measure voltage between ground and fuel tank unit harness connector C305 terminal No. 3 (Red/Yellow wire). About 12 volts should exist. If voltage is as specified, go to next step. If voltage is not as specified, repair open or short in Red/Yellow wire between fuel tank unit harness connector and main relay. fuel tank unit harness connector
4. Measure Canister Close Valve (CCV) resistance. Resistance should be about 25 ohms at 68°F (20°C). If resistance is within specification, visually check connector terminals for damage, corrosion or other problem. Repair or replace as necessary. If resistance is not within specification, replace CCV.

1. Turn ignition off. Remove rear seat. Disconnect ECM 88-pin connector and fuel tank unit 4-pin connector C305. Measure resistance of Black/Green wire between fuel tank unit connector C305 terminal No. 2 and ECM connector terminal No. 71. see scheme 6and see scheme 7. If resistance is less than one ohm, go to next step. If resistance is one ohm or more, repair open in Black/Green wire between fuel tank unit and ECM.
2. Connect ECM connector. Turn ignition on. Backprobe and measure voltage between ECM connector terminal No. 76 (Light Green/Yellow wire) and ground. Voltage should be 5.6-5.8 volts. Measure voltage between ground and fuel tank unit connector C305 terminal No. 4 (Light Green/Yellow wire). Voltage should be 5.6-5.8 volts. If each voltage is as specified, go to next step. If each voltage is more than specified, locate and repair short to power in Light Green/Yellow wire between ECM and fuel tank unit. If voltage at ECM connector is within specifications and voltage at fuel tank unit is less than specifications, locate and repair open in Light Green/Yellow wire between ECM and fuel tank unit.
3. Turn ignition off. Remove FTPS from fuel tank unit. Connect FTPS connector. Turn ignition on. Backprobe and measure voltage between ECM connector terminal No. 76 (Light Green/Yellow wire) and ground. see scheme 6 Voltage should be 2.18-2.82 volts. If voltage is as specified, go to next step. If voltage is not as specified, replace FTPS.
4. Turn ignition off. Disconnect hose between EVAP canister and CCV at EVAP canister end. Blow through hose and check if air escapes from port on back of CCV. Air should escape. Turn ignition on. Backprobe and connect jumper wire between ECM connector terminal No. 18 (color not available) and ground. Blow through hose and check if air escapes from port on back of CCV. Air should not escape. Repeat test 4-5 times to ensure reliability of results. If CCV reliably operates as specified, check connectors between ECM and FTPS for loose, damaged or corroded terminals. If problem exists, repair appropriate connector. If CCV does not operate as specified, or operation is not reliable, check hose between EVAP canister and CCV for restriction. If problem exists, repair hose as necessary. If problem does not exist, replace CCV.

1. Turn ignition off. Remove rear seat. Disconnect fuel tank unit 4-pin connector C305. Turn ignition on. Measure voltage between ground and fuel tank unit connector C305 terminal No. 1 (Blue/White wire). see scheme 7 Voltage should be about 5 volts. If voltage is as specified, go to next step. If voltage is not as specified, repair short to ground or open in Blue/White wire between fuel tank unit and ECM.
2. Measure voltage between ground and fuel tank unit connector C305 terminal No. 4 (Light Green/Yellow wire). Voltage should be 5.6-5.8 volts. If voltage is as specified, go to next step. If voltage is not as specified, repair short to ground in Light Green/Yellow wire between fuel tank unit and ECM.
3. Turn ignition off. Remove FTPS from fuel tank. Connect fuel tank unit connector C305 to FTPS. Turn ignition on. Backprobe and measure voltage between ECM connector terminal no. 76 (Light Green/Yellow wire) and ground. see scheme 6 Voltage should be 2.18-2.82 volts. If voltage is not as specified, replace FTPS. If voltage is as specified, check connectors for loose, damaged or corroded terminals. If problem exists, repair appropriate connector.

1. Turn ignition off. Remove rear seat. Disconnect fuel tank unit 4-pin connector C305. Turn ignition on. Measure voltage between ground and fuel tank unit connector C305 terminal No. 4 (Light Green/Yellow wire). see scheme 7 Voltage should be 5.6-5.8 volts. If voltage is as specified, go to next step. If voltage is not as specified, repair open or short to power in Light Green/Yellow wire between FTPS and ECM.
2. Measure voltage between ground and fuel tank unit connector C305 terminal No. 1 (Blue/White wire). Voltage should be about 5 volts. If voltage is as specified, go to next step. If voltage is not as specified, repair short to power in Blue/White wire between fuel tank unit and ECM.
3. Turn ignition off. Disconnect ECM 88-pin connector. Measure resistance of Black/Green wire between fuel tank unit connector C305 terminal No. 2 and ECM connector terminal No. 71. see scheme 6and see scheme 7. If resistance is less than one ohm, go to next step. If resistance is one ohm or more, repair open in Black/Green wire between fuel tank unit and ECM.
4. Remove FTPS from fuel tank. Connect fuel tank unit connector C305 to FTPS. Connect ECM connector. Turn ignition on. Backprobe and measure voltage between ECM connector terminal No. 76 (Light Green/Yellow wire) and ground. Voltage should be 2.18-2.82 volts. If voltage is as specified, check connectors for loose, damaged or corroded terminals. If problem exists, repair as necessary. If voltage is not as specified, replace FTPS.

1. Turn ignition switch to OFF position. Disconnect Fuel Level Sensor (FLS) harness connector. Turn ignition switch to ON position. Measure voltage of FLS signal circuit between FLS harness connector and ground. About 5 volts should exist. If voltage is as specified, go to next step. If voltage is not as specified, repair open in harness between FLS and ECM harness connectors. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
2. Thoroughly check FLS and ECM for loose, bent, corroded, contaminated, deteriorated or damaged connectors. If problem is found. repair or replace as necessary. If no problem is found, temporarily install a known good FLS and check for proper operation. Go to next step.
3. Return vehicle to original condition. Clear all diagnostic trouble codes. Verify by driving vehicle with scan tool connected to DLC and monitor for pending codes.

1. Turn ignition off. Check METER fuse (10-amp). If fuse is okay, go to next step. If fuse is blown, replace fuse and repair short to ground in circuit between fuse and VSS. See appropriate wiring diagram under WIRING DIAGRAMS in appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT.
2. Disconnect VSS 3-pin connector. Turn ignition on. If vehicle has automatic transaxle, measure voltage between ground and VSS connector terminal No. 1 (Yellow wire). see scheme 14 If vehicle has manual transaxle, measure voltage between ground and VSS connector terminal No. 3 (Yellow wire). see scheme 15 If battery voltage exists, go to next step. If battery voltage does not exist, repair open in Yellow wire between METER fuse (10-amp) and VSS.
3. Turn ignition off. Measure resistance between ground and VSS connector terminal No. 2 (Black wire). If resistance is less than one ohm, go to next step. If resistance is one ohm or more, repair open in Black wire between VSS and ground. Ground point is located below left side of instrument panel.
4. Connect VSS connector. Locate White 10-pin intermediate connector C203 below instrument panel, to left of center console. Backprobe and connect positive lead of 2-channel lab scope to intermediate connector C203 terminal No. 1 (Orange/Black wire). see scheme 11 Backprobe and connect negative lead of lab scope to intermediate connector C203 terminal No. 9 (Green/Orange wire). Adjust time to 50 milliseconds. Adjust "A" and "B" voltages to 5 volts. Adjust patterns so they are stacked. Go to next step. NOTE: Upper waveform displayed on lab scope is VSS input into speedometer. Bottom waveform is VSS output from speedometer.
5. Raise vehicle on lift until tires are at least 6" off the floor. Start engine and shift into second gear. Compare waveforms generated at 5 MPH to normal and abnormal waveforms. see scheme 20- see scheme 22. If waveform indicates short to power on speedometer VSS output side, go to next step. If waveform indicates short to ground on speedometer VSS output side, go to step 8. If waveform indicates short to power on speedometer VSS input side, go to step 11. If waveform indicates short to ground on speedometer VSS input side, go to step 12. If waveform is normal, check connectors for loose, damaged or corroded terminals. If problem exists, repair appropriate connector.
6. Turn ignition off. Disconnect lab scope leads from intermediate connector C203. Remove instrument cluster and disconnect instrument cluster connector 12-pin connector C230. see scheme 23 Disconnect ECM 88-pin connector, Transaxle Control Module (TCM) 88-pin connector (if applicable), and cruise control 10-pin connector (if applicable). Turn ignition on. Check for voltage at connector intermediate C203 terminal No. 1 (Orange/Black wire). If voltage exists, repair short to power in Orange/Black wire between instrument cluster and ECM, TCM or cruise control. If voltage does not exist, go to next step.
7. Inspect printed circuit board for signs of shorting between instrument cluster connector C230 and speedometer. If problem exists, replace printed circuit board. If problem does not exist, replace speedometer, then return to step 4).
8. Turn ignition off. Remove lab scope leads from intermediate connector C203. Remove instrument cluster and disconnect instrument cluster connector 12-pin connector C230. see scheme 23 Disconnect ECM 88-pin connector, Transaxle Control Module (TCM) 88-pin connector (if applicable), and cruise control 10-pin connector (if applicable). Check for continuity between ground and intermediate connector C203 terminal No. 1 (Orange/Black wire). If continuity exists, repair short to ground in Orange/Black wire between instrument cluster and ECM, TCM or cruise control module, then return to step 4). If continuity exists, go to next step.
9. Measure resistance of Orange/Black wire between instrument cluster connector C230 terminal No. 3 and ECM connector terminal No. 42. see scheme 6and see scheme 10. If resistance is less than one ohm, go to next step. If resistance is one ohm or more, repair open in Orange/Black wire between instrument cluster and ECM, then return to step 4).
10. Inspect printed circuit board for signs of opens between instrument cluster connector C230 and speedometer. If problem exists, replace printed circuit board. If problem does not exist, replace speedometer, then return to step 4).
11. Turn ignition off. Remove lab scope leads from intermediate connector C203. Remove instrument cluster and disconnect instrument cluster connector 12-pin connector C230. see scheme 23 Disconnect VSS 3-pin connector. Turn ignition on. Measure voltage between ground and instrument cluster connector C230 terminal No. 8 (Green/Orange wire). If voltage exists, repair short to power in Green/Orange wire between instrument cluster and VSS, then return to step 4). If voltage does not exist, replace VSS, then return to step 4).
12. Turn ignition off. Remove lab scope leads from intermediate connector C203. Remove instrument cluster and disconnect instrument cluster connector 12-pin connector C230. see scheme 23 Disconnect VSS 3-pin connector. Check for continuity between ground and instrument cluster connector C230 terminal No. 8 (Green/Orange wire). If continuity exists, repair short to ground in Green/Orange wire between instrument cluster and VSS, then return to step 4). If continuity does not exist, go to next step.
13. Measure resistance of Green/Orange wire between instrument cluster connector C230 terminal No. 8 and VSS connector terminal No. 1 (automatic transaxle) or No. 3 (manual transaxle). see scheme 10, see scheme 14 and see scheme 15. If resistance is less than one ohm, replace VSS, then return to step 4). If resistance is one ohm or more, repair open in Green/Orange wire between instrument cluster and VSS, then return to step 4).

Scheme 30

Scheme 31

Scheme 32

Scheme 33

Note. If DTCs, or pending codes, related to TPS, MAF sensor, fuel injector or IAC valve are present, repair those first. Using scan tool, clear DTCs. Drive vehicle with KIA Data Pro connected to OBD-II Data Link Connector (OBD-II DLC) and monitor for pending codes. If DTC P0506 returns, perform following procedure.

1. Turn ignition off. Disconnect IAC valve 3-pin connector. Turn ignition on. Measure voltage between ground and IAC valve connector terminal No. 2 (Red/Yellow wire). see scheme 9 If battery voltage exists, go to next step. If battery voltage does not exist, repair open in Red/Yellow wire between INJ fuse (10-amp) and IAC valve.
2. Turn ignition off. Measure resistance between IAC valve connector terminals No. 1 and 2 (White/Yellow wire and Red/Yellow wire - component side). Also, measure resistance between IAC valve connector terminals No. 2 and 3 (Red/Yellow wire and White/Green wire - component side). Each resistance should be 14-18 ohms at 68°F (20°C). If each resistance is as specified, go to next step. If either resistance is not as specified, replace IAC valve.
3. Disconnect ECM 88-pin connector. Measure resistance of White/Yellow wire between IAC valve connector terminal No. 1 and ECM connector terminal No. 2. see scheme 6and see scheme 9. Also, measure resistance of White/Green wire between IAC valve connector terminal No. 3 and ECM connector terminal No. 29. If each resistance is less than one ohm, go to next step. If either resistance is one ohm or more, repair open in appropriate wire between IAC valve and ECM.
4. Remove IAC valve from throttle body. Check IAC valve for excessive carbon deposits. If problem exists, clean or replace IAC valve as necessary, then go to next step. If problem does not exist, go to next step.
5. Connect jumper wire between battery positive terminal and IAC valve connector terminal No. 2 (component side). Connect another jumper wire to ground. While observing for IAC valve movement, in turn, momentarily touch grounded jumper wire to IAC valve terminals No. 1 and 3. IAC valve should close when IAC valve connector terminal No. 1 is grounded. IAC valve should open when IAC valve connector terminal No. 3 is grounded. Repeat test several times to ensure reliability of results. If IAC valve reliably performs as specified, check connectors for loose, damaged or corroded terminals. If problem exists, repair appropriate connector. If IAC valve does not reliably perform as specified, replace IAC valve.

1. Check accelerator free play. Free play should be.040-120" (1-3 mm). If free play is as specified, go to next step. If free play is not as specified, adjust accelerator cable.
2. Check for leaking or disconnected vacuum hoses. Also, check PCV valve and Purge Solenoid Valve (PSV) for proper installation and operation. See «POSITIVE CRANKCASE VENTILATION (PCV)»(ref-3159-S29763870002000041800000) under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. See «FUEL EVAPORATION»(ref-3159-S17860701472000041800000) under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If problem exists, repair as necessary. If problem does not exist, go to next step.
3. Remove intake hose and inspect throttle plate for excessive carbon deposits. If throttle plate has carbon deposits, clean throttle plate with O2 sensor safe carburetor cleaner. If throttle plate does not have carbon deposits, go to next step.
4. Start engine and let idle. Backprobe and measure voltage (TP sensor output voltage) between ECM connector terminal No. 73 (Blue/Orange wire) and ground. see scheme 6 Voltage should be 400-600 millivolts. If voltage is as specified, go to next step. If voltage is not as specified, check TP sensor circuit. See «DTC P0123: THROTTLE POSITION (TP) SENSOR CIRCUIT HIGH INPUT»(ref-3156-S35055792682000041800000).
5. Turn ignition off. Disconnect IAC valve 3-pin connector. Measure resistance between IAC valve connector terminals No. 1 and 2 (White/Yellow wire and Red/Yellow wire - component side). see scheme 9 Also, measure resistance between IAC valve connector terminals No. 2 and 3 (Red/Yellow wire and White/Green wire - component side). Resistance should be 14-18 ohms at 68°F (20°C). If each resistance is as specified, go to next step. If either resistance is not as specified, replace IAC valve.
6. Remove IAC valve from throttle body. Check IAC valve for excessive carbon deposits. If problem exists, clean or replace IAC valve as necessary, then go to next step. If problem does not exist, go to next step.
7. Connect jumper wire between battery positive terminal and IAC valve connector terminal No. 2 (component side). Connect another jumper wire to ground. While observing for IAC valve movement, in turn, momentarily touch grounded jumper wire to IAC valve connector terminals No. 1 and 3. IAC valve should close when IAC valve connector terminal No. 1 is grounded. IAC valve should open when IAC valve connector terminal No. 3 is grounded. Repeat test several times to ensure reliability of results. If IAC valve reliably performs as specified, go to next step. If IAC valve does not reliably perform as specified, replace IAC valve.
8. Disconnect ECM 88-pin connector. Measure resistance of White/Yellow wire between IAC valve connector terminal No. 1 and ECM connector terminal No. 2. see scheme 6and see scheme 9. Also, measure resistance of White/Green wire between IAC valve connector terminal No. 3 and ECM connector terminal No. 29. If each resistance is less than one ohm, go to next step. If either resistance is one ohm or more, repair open in appropriate wire between IAC valve and ECM. CAUTION: DO NOT spray carburetor cleaner on or near coils or plug wires. Allow enough time between checking areas for carburetor spray to dissipate.
9. Connect all connectors. Start engine and allow it to reach normal operating temperature. With engine idling, backprobe and monitor voltage between front HO2S connector terminal No. 4 (Green/Brown wire) and ground. With engine idling, spray short bursts of aerosol carburetor cleaner in following areas while observing changes in front HO2S voltage: Throttle body gasket. Gasket between intake manifold and cylinder head. Gasket between intake manifold and surge tank. Seals between intake manifold and fuel injectors. Seal between surge tank and PCV pipe. A rise in voltage that lasts about as long as duration of carburetor cleaner spray indicates an intake leak. If a leak is indicated, repair as necessary.

Note. Vehicle will not run if IG COIL fuse (10-amp), INJ fuse (10-amp) or ECM B+ fuse (10-amp) is blown. If any of these fuses are blown, locate and repair short, then replace appropriate fuse before continuing diagnosis.

1. Check battery condition and generator output. See appropriate GENERATORS & REGULATORS article in STARTING & CHARGING SYSTEMS. If problem does not exist, go to next step. If problem exists, repair as necessary. NOTE: Using a breakout box will make following tests easier.
2. Turn ignition on. Backprobe and measure voltage between ECM connector terminal No. 26 (Pink wire) and ground. see scheme 6 Also, backprobe and measure voltage between ECM connector terminal No. 54 (Red/Yellow wire) and ground. And backprobe and measure voltage between ECM connector terminal No. 58 (Yellow wire) and ground. If battery voltage exists at each terminal, go to next step. If battery voltage does not exist at a terminal, repair open in appropriate wire. See appropriate wiring diagram in WIRING DIAGRAMS.
3. Drive vehicle while monitoring voltage at ECM connector terminals No. 26, 54 and 58. If voltage stays stable at battery voltage at each terminal, check connectors for loose, damaged or corroded terminals. If problem exists, repair appropriate connector. If voltage is unstable at a terminal, locate intermittent poor contact and repair as necessary. If voltage is unstable at ECM connector terminal No. 54, also check EGI main relay control circuit connections and wiring for intermittent poor contact. Repair as necessary. See appropriate wiring diagram in WIRING DIAGRAMS.

1. Check continuity of BTN fuse (30-amp) in engine compartment fuse/relay box. Check continuity of ECM B+ fuse (10-amp) in passenger compartment fuse box. If either fuse is blown, locate and repair short to ground in appropriate wire, then replace fuse. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. If both fuses are okay, go to next step.
2. Backprobe and measure voltage between ECM connector terminal No. 26 (Pink wire) and ground. see scheme 6 If battery voltage exists, go to next step. If battery voltage does not exist, repair open in Pink wire between ECM and passenger compartment fuse box.
3. Using scan tool, clear DTCs. Drive vehicle and monitor voltage at ECM connector terminal No. 26 (Pink wire). If voltage stays constant and pending code returns, replace ECM. If voltage fluctuates, check connectors for loose, damaged or corroded terminals. If problem exists, repair appropriate connector. If problem does not exist, check wiring harness for damaged or broken wires and repair as necessary.

Note. If DTC P0116, P0117, P0118, P0122, P0123, P0125 and/or P1121 are present, repair those DTCs first. Using scan tool, clear DTCs. Drive vehicle with KIA Data Pro connected to OBD-II Data Link Connector (OBD-II DLC) and monitor for pending codes. If DTC P1115 returns, perform following procedure.

1. Turn ignition off. Disconnect ECM 88-pin connector and TCM 88-pin connector. Measure resistance of Light Green/Yellow wire between ECM connector terminal No. 38 and TCM connector terminal No. 38. see scheme 6 If resistance is less than one ohm, go to next step. If resistance is one ohm or more, repair open in Light Green/Yellow wire between ECM and TCM.
2. Check for continuity between ground and ECM connector terminal No. 38 (Light Green/Yellow wire). If continuity exists, repair short to ground in Light Green/Yellow wire between ECM and TCM. If continuity does not exist, go to next step.
3. Turn ignition on. Check for voltage between ground and ECM connector terminal No. 38 (Light Green/Yellow wire). If voltage exists, repair short to power in Light Green/Yellow wire between ECM and TCM. If voltage does not exist, go to next step. NOTE: DO NOT use OBD-II Data Link Connector (OBD-II DLC) for lab scope power source as this will affect waveform.
4. Turn ignition off. Connect ECM connector and TCM connector. Connect lab scope positive lead to ECM connector terminal No. 38 (Light Green/Yellow wire). Connect lab scope negative lead to ground. Set lab scope time to 2 milliseconds, voltage to 2 volts and level to zero volts. Turn ignition on and observe TP sensor signal waveform. see scheme 24 Crank engine and observe engine coolant temperature signal waveform. see scheme 25 If either TP sensor signal waveform or water temperature signal waveform is faulty, replace ECM. If TP sensor signal waveform and water temperature signal waveform are okay, check connectors for loose, damaged or corroded terminals. If problem exists, repair appropriate connector.

Scheme 34

Scheme 35

Note. If DTC P0501 or P1500 is present, or pending, repair first. Using scan tool, clear DTCs. Drive vehicle with KIA Data Pro connected to OBD-II Data Link Connector (OBD-II DLC) and monitor for pending codes. If DTC P1308 or P1309 returns, perform following procedure.

1. Turn ignition off. Disconnect CAS 3-pin connector. Disconnect ECM 88-pin connector. Measure resistance of Red/Black wire between CAS connector terminal No. 3 and ECM connector terminal No. 80. see scheme 2and see scheme 6. If resistance is less than one ohm, go to next step. If resistance is one ohm or more, repair open in Red/Black wire between CAS and ECM.
2. Check for continuity between ground and CAS connector terminal No. 3 (Red/Black wire). If continuity exists, repair short to ground in Red/Black wire between CAS and ECM. If continuity does not exist, go to next step.
3. Measure resistance of Black/Green wire between CAS connector terminal No. 2 and ECM connector terminal No. 71. If resistance is less than one ohm, go to next step. If resistance is one ohm or more, repair open in Black/Green wire between CAS and ECM.
4. Turn ignition on. Check for voltage between ground and CAS connector terminal No. 3 (Red/Black wire). If voltage exists, repair short to power in Red/Black wire between CAS and ECM. If voltage does not exist, go to next step.
5. Turn ignition off. Connect ECM connector. Turn ignition on. Measure voltage between ground and CAS connector terminal No. 1 (Blue/White wire). see scheme 2 Voltage should be about 5 volts. If voltage is as specified, go to next step. If voltage is not as specified, repair open or short to power in Blue/White wire between CAS and engine compartment fuse/relay box.
6. Turn ignition off. Remove CAS from vehicle and connect connector to CAS. Turn ignition on. Holding CAS still, backprobe and measure voltage between ECM connector terminal No. 80 (Red/Black wire) and ground. see scheme 6 Voltage should be about 2.5 volts. Hold CAS with base parallel to floor and briskly shake CAS up and down. Voltage should quickly vary between.1-5 volts. If CAS voltage is not as specified, replace CAS. If CAS voltage is as specified, go to next step.
7. Check connectors for loose, damaged or corroded terminals. If problem exists, repair connectors as needed, then test drive vehicle. If problem does not exist, test drive vehicle. If pending DTC P1307 appears during drive, check Vehicle Speed Sensor (VSS) wiring. See appropriate wiring diagram in appropriate ELECTRONIC CONTROLS article in AUTOMATIC TRANSMISSIONS. If problem exists, repair as necessary.

Note. Record all freeze frame data before disconnecting any connectors or clearing DTCs.

1. Turn ignition off. Disconnect ECM 88-pin connector. Check for continuity between ECM connector terminals No. 70 and 71 (Yellow/Blue wire and Black/Green wire). see scheme 6 If continuity does not exist, go to next step. If continuity exists, go to step 3.
2. Check for continuity between ground and ECM connector terminals No. 70 (Yellow/Blue wire) and No. 71 (Black/Green wire). see scheme 6 If continuity exists between ground and either terminal, repair short to ground in appropriate wire between knock sensor and ECM. If continuity does not exist between ground and either terminal, check connectors for loose, damaged or corroded terminals. If problem exists, repair appropriate connector. If problem does not exist, replace knock sensor.
3. Disconnect knock sensor connector. Check for continuity between ECM connector terminals No. 70 and 71 (Yellow/Blue wire and Black/Green wire). If continuity exists, repair shorted wires between knock sensor and ECM. If continuity does not exist, replace knock sensor.

1. Turn ignition on. Set A/C switch off and blower switch to No. 1 position. Backprobe and measure voltage between ECM connector terminal No. 64 (Gray/Red wire) and ground. see scheme 6 If voltage is about 5 volts, go to next step. If voltage is not about 5 volts, check for short to ground or short to power in wire between A/C switch terminal No. 2 (Green/Orange wire) and ECM terminal No. 64 (Gray/Red wire). see scheme 1 Also, check A/C switch for internal short. If problem exists, repair as necessary.
2. Turn A/C switch on. Backprobe and measure voltage between ECM connector terminal No. 64 (Gray/Red wire) and ground. If voltage does not exist, go to next step. If voltage exists, repair open in wire(s) or connector(s) between grounding junction connector No. 20 and ECM connector terminal No. 64. Grounding junction connector No. 20 is located behind right side of instrument panel. NOTE: A/C switch input circuit starts as Black/Red wire from A/C thermostat, then becomes Brown/Green wire at White 13-pin intermediate connector C225, located behind right side of instrument panel, near kick panel. Brown/Green wire passes through engine compartment fuse/relay box and connects to differential pressure switch, located in right side of engine compartment. Brown/Yellow wire leaves differential pressure switch, passes through engine compartment fuse/relay box and terminates at ECM connector terminal No. 65.
3. Turn A/C switch and blower switch off. Leave ignition on. Backprobe and measure voltage between ECM connector terminal No. 65 (Brown/Yellow wire) and ground. If voltage is about 5 volts, check for intermittent short between A/C thermostat connector terminal No. 2 (Black/Red wire) and ECM connector terminal No. 65 (Brown/Yellow wire). If problem exists, repair as necessary. If voltage is 8-9 volts, verify A/C switch is off. If A/C switch is on, turn A/C switch off and repeat step 3). If A/C switch is off, replace A/C switch. If voltage is about zero volts, check for shorted A/C thermostat. If problem exists, replace A/C thermostat. If problem does not exist, repair short to ground in wire between A/C thermostat and ECM connector terminal No. 65.

1. Turn ignition off. Disconnect IAC valve 3-pin connector. Turn ignition on. Measure voltage between ground and IAC valve connector terminal No. 2 (Red/Yellow wire). see scheme 9 If battery voltage exists, go to next step. If battery voltage does not exist, repair open in Red/Yellow wire between IAC valve connector and INJ fuse (10-amp), located in engine compartment fuse/relay box.
2. Turn ignition off. Disconnect ECM 88-pin connector. Measure resistance of White/Green wire between IAC valve connector terminal No. 3 and ECM connector terminal No. 29. see scheme 6and see scheme 9. If code is DTC P1505 and resistance is less than one ohm, go to next step. If code is DTC P1506 and resistance is less than one ohm, go to step 4. If resistance is not as specified, repair open in White/Green wire between IAC valve and ECM.
3. Check for continuity between ground and ECM connector terminal No. 29 (White/Green wire). If continuity does not exist, go to step 5. If continuity exists, repair short to ground in White/Green wire between IAC valve and ECM.
4. Turn ignition on. Check for voltage between ground and ECM connector terminal No. 29 (White/Green wire). If voltage does not exist, go to next step. If voltage exists, repair short to power in White/Green wire between IAC valve and ECM.
5. Turn ignition off. Measure resistance between IAC valve connector terminals No. 1 and 2 (White/Yellow wire and Red/Yellow wire - component side). Also, measure resistance between IAC valve connector terminals No. 2 and 3 (Red/Yellow wire and White/Green wire - component side). Resistance should be 16.5-18.5 ohms at 68°F (20°C). If resistance is not as specified, replace IAC valve. If resistance is as specified, check connectors for loose, damaged or corroded terminals. If problem exists, repair connector as necessary.

1. Turn ignition off. Disconnect IAC valve 3-pin connector. Turn ignition on. Measure voltage between ground and IAC valve connector terminal No. 2 (Red/Yellow wire). see scheme 9 If battery voltage exists, go to next step. If battery voltage does not exist, repair open in Red/Yellow wire between engine compartment fuse/relay box and IAC valve.
2. Turn ignition off. Disconnect ECM 88-pin connector. Measure resistance of White/Yellow wire between IAC valve connector terminal No. 1 and ECM connector terminal No. 2. see scheme 6and see scheme 9. If code is DTC P1507 and resistance is less than one ohm, go to next step. If code is DTC P1508 and resistance is less than one ohm, go to step 4. If resistance is not as specified, repair open in White/Yellow wire between IAC valve and ECM.
3. Check for continuity between ground and ECM connector terminal No. 2 (White/Yellow wire). If continuity does not exist, go to step 5. If continuity exists, repair short to ground in White/Yellow wire between IAC valve and ECM.
4. Turn ignition on. Check for voltage between ground and ECM connector terminal No. 2 (White/Yellow wire). If voltage does not exist, go to next step. If voltage exists, repair short to power in White/Yellow wire between IAC valve and ECM.
5. Turn ignition off. Measure resistance between IAC valve connector terminals No. 1 and 2 (White/Yellow wire and Red/Yellow wire - component side). see scheme 9 Also, measure resistance between IAC valve connector terminals No. 2 and 3 (Red/Yellow wire and White/Green wire - component side). Resistance should be 16.5-18.5 ohms at 68°F (20°C). If resistance is not as specified, replace IAC valve. If resistance is as specified, check connectors for loose, damaged or corroded terminals. If problem exists, repair connector as necessary.

Note. Record all freeze frame data before disconnecting connectors or clearing codes.

1. On manual transaxle, go to step 4. On automatic transaxle, turn ignition off. Disconnect ECM 88-pin connector. Measure resistance between ground and ECM connector terminal No. 72 (Black/Yellow wire). see scheme 6 If resistance is less than one ohm, go to next step. If resistance is one ohm or more, repair open in Black/Yellow wire between ECM and ground.
2. Connect ECM connector. Turn ignition on. Put gear selector in "D" and measure voltage between ground and ECM connector terminal No. 86 (Red/Yellow wire). Voltage should be 8-10 volts on vehicles with cruise control and about 5 volts on vehicles without cruise control. If voltage is not as specified, go to next step. If voltage is as specified, check connectors for loose, damaged or corroded connections. If problem exists, repair appropriate connector. If problem does not exists, perform wiggle test while retesting voltage. If any intermittents are located, repair wiring as necessary.
3. Disconnect transaxle range switch 9-pin connector. Measure voltage between ground and ECM connector terminal No. 86 (Red/Yellow wire). Voltage should be 8-10 volts on vehicles with cruise control and about 5 volts on vehicles without cruise control. If voltage is as specified, replace transaxle range switch. If voltage is about zero volts, repair short to ground in wire between ECM, cruise control unit, ignition switch, Transaxle Control Module (TCM) and transaxle range switch.
4. Turn ignition off. Disconnect ECM 88-pin connector. Measure resistance between ground and ECM connector terminal No. 72 (should be blank pin). see scheme 6 If resistance is one ohm or more, go to next step. If resistance is less than one ohm, check engine harness part number to ensure proper harness is in vehicle. It part number is okay, cut wire at ECM connector terminal No. 72.
5. Measure resistance between ground and ECM connector terminal No. 86 (Red/Yellow wire). If resistance is less than one ohm, check connectors for loose, damaged or corroded terminals. If problem exists, repair appropriate connector. If resistance is one ohm or more, repair open in Red/Yellow wire between ECM connector terminal No. 86 and ground.

1. If DTC is P1614, go to next step. If DTC is 1611, turn ignition off. Disconnect TCM 88-pin connector and ECM 88-pin connector. Check for continuity between ground and TCM connector terminal No. 27 (White/Blue wire). see scheme 6 If continuity does not exist, go to step 3. If continuity exists, repair short to ground in White/Blue wire or Yellow/Blue wire between ECM and TCM.
2. Turn ignition off. Disconnect TCM 88-pin connector and ECM 88-pin connector. Measure resistance of circuit between TCM connector terminal No. 27 (White/Blue wire) and ECM connector terminal No. 61 (Yellow/Blue wire). If resistance is less than one ohm, go to next step. If resistance is more than one ohm repair open in White/Blue wire between TCM and engine compartment fuse/relay box or Yellow/Blue wire between engine compartment fuse/relay box and ECM.
3. Turn ignition on. Check for voltage between ground and ECM connector terminal No. 61 (Yellow/Blue wire). If voltage does not exist, go to next step. If voltage exists, repair short to power in Yellow/Blue wire or White/blue wire between ECM and TCM.
4. Turn ignition off. Connect ECM connector and TCM connector. Backprobe and connect DVOM positive lead to TCM connector terminal No. 27 (White/Blue wire). Connect DVOM negative lead to ground. While monitoring DVOM (MIL circuit voltage), turn ignition on. When ignition is turned on, voltage should momentarily spike to 4-8 volts, then immediately drop to less than one volt. About 2.3 seconds after ignition is turned on, voltage should jump to battery voltage and remain there. If MIL circuit voltages are as specified, check connectors between ECM and TCM for loose, damaged or corroded terminals. If problem exists, repair appropriate connector. If MIL circuit voltages are not as specified and are less than one volt, replace ECM. If MIL circuit voltages are not as specified and are constant 12 volts, replace TCM.

Using scan tool, retrieve DTCs set by TCM. Follow repair procedure for TCM DTCs. See appropriate ELECTRONIC CONTROLS article in AUTOMATIC TRANSMISSIONS.

Note. If Light Green/Black wire between engine cooling fan relay and ECM is shorted to ground, cooling fan will run whenever ignition is on.

1. Turn ignition off. Remove cooling fan relay from engine compartment fuse/relay box. Measure resistance between cooling fan relay terminals No. 2 and 4 (across coil winding and resistor). (Scheme 30) Resistance should be about 80 ohms at 68°F (20°C). If resistance is as specified, go to next step. If resistance is not as specified, replace cooling fan relay.
2. Disconnect battery negative cable. Disconnect positive battery cable from engine compartment fuse/relay box. Disconnect ECM 88-pin connector. Remove engine compartment fuse/relay box from bracket and disconnect Black 68-pin connector C192 from center of engine compartment fuse/relay box. Measure resistance of Light Green/Black wire between ECM connector terminal No. 22 and engine compartment fuse/relay box connector C192 terminal No. 14. see scheme 5and see scheme 6.
3. Check for continuity between ground and ECM connector terminal No. 22 (Light Green/Black wire). If continuity does not exist, go to next step. If continuity exists, repair short to ground in Light Green/Black wire between ECM and engine compartment fuse/relay box or underhood Data Link Connector (DLC).
4. Connect connector C192 and battery positive cable to engine compartment fuse/relay box. Connect battery negative cable. Turn ignition on. Check for voltage between ground and ECM connector terminal No. 22 (Light Green/Black wire). If voltage exists, repair short to power in Light Green/Black wire between engine compartment fuse/relay box and ECM or DLC. If voltage does not exist, check connectors for loose, damaged or corroded terminals. If problem exists, repair appropriate connector, then go to next step. If problem does not exist, go to next step.
5. Test drive vehicle. If DTC P1673 is pending returns, or cooling fan does not operate, replace relay. Test drive vehicle again. If problem still exists, replace engine compartment fuse/relay box.

Scheme 36

1. Turn ignition off. Disconnect ECM 88-pin connector. Turn ignition on. Using jumper wire, ground ECM connector terminal No. 8 (Brown/White wire). see scheme 6 If MIL illuminates, go to next step. If MIL does not illuminate, remove instrument cluster and check MIL bulb. If bulb is blown, replace bulb. If bulb is okay, repair open in Yellow wire between METER fuse (10-amp) and MIL, or in Brown/White wire between MIL and ECM.
2. Remove jumper wire from ECM connector terminal No. 8. If MIL goes out, check connectors in MIL circuit for loose, damaged or corroded terminals. If problem exists, repair appropriate connector. If MIL does not go out, repair short to ground in Brown/White wire between MIL and ECM.

1. Turn ignition off. Disconnect ECM 88-pin connector and TCM 88-pin connector. Measure resistance of Red/Brown wire between ECM connector terminal No. 85 and TCM connector terminal No. 51. see scheme 6 If resistance is less than one ohm, go to next step. If resistance is one ohm or more, repair open in Red/Brown wire between ECM and TCM.
2. Check for continuity between ground and ECM connector terminal No. 85 (Red/Brown wire). If continuity does not exist, go to next step. If continuity exists, repair short to ground in Red/Brown wire between ECM and TCM.
3. Turn ignition on. Check for voltage between ground and ECM connector terminal No. 85 (Red/Brown wire). If voltage exists, repair short to power in Red/Brown wire between ECM and TCM. If voltage does not exist, check connectors for loose, damaged or corroded terminals. If problem exists, repair appropriate connector.