Engine Controls - System/component Tests - Non-Turbo: Other Eagle Talon II

ENGINE COOLANT TEMPERATURE SENSOR

Turn ignition off. Disconnect Engine Coolant Temperature (ECT) sensor connector. For ECT sensor location, see ENGINE COOLANT TEMPERATURE (ECT) SENSOR LOCATION table. Using a DVOM, measure resistance between ECT sensor terminals. See ENGINE COOLANT TEMPERATURE (ECT) SENSOR RESISTANCE table.

ENGINE COOLANT TEMPERATURE (ECT) SENSOR LOCATION (1)

ENGINE COOLANT TEMPERATURE (ECT) SENSOR RESISTANCE

Front HO2S Connector. Scheme 78

Rear HO2S Connector. Scheme 79

Front HO2S

1. Disconnect front Heated Oxygen Sensor (HO2S) connector. Using a DVOM, check for continuity between front HO2S connector terminals No. 3 and 4. (Scheme 78) If continuity is present, go to next step. If continuity is not present, replace front HO2S. CAUTION: Use caution when connecting jumper wires to front HO2S connector. Front HO2S can be damaged if jumper wires are improperly connected.
2. Start engine and run until normal operating temperature is reached. Using a jumper wire, connect front HO2S connector terminal No. 3 to positive battery terminal. Using another jumper wire, connect front HO2S connector terminal No. 4 to negative battery terminal. NOTE: Repeatedly racing engine causes air/fuel ratio to go rich.
3. Connect a DVOM between front HO2S connector terminals No. 1 and 2. (Scheme 78) While repeatedly racing engine, observe front HO2S voltage. While racing engine, DVOM should display.6-1.0 volt. If DVOM does not display.6-1.0 volt, front HO2S is defective. Replace front HO2S. If DVOM displays.6-1.0 volt, front HO2S is functioning properly.

Rear HO2S

1. Disconnect rear Heated Oxygen Sensor (HO2S) connector. Using a DVOM, check for continuity between rear HO2S connector terminals No. 1 and 2. (Scheme 79) If continuity is present, go to next step. If continuity is not present, replace rear HO2S. NOTE: Repeatedly racing engine causes air/fuel ratio to go rich.
2. Using a scan tool, observe rear HO2S operation (voltage). While repeatedly racing engine, observe rear HO2S voltage. While racing engine, scan tool should display.6-1.0 volt. If scan tool does not display.6-1.0 volt, rear HO2S is defective. Replace rear HO2S. If DVOM displays.6-1.0 volt, rear HO2S is functioning properly.

INTAKE AIR TEMPERATURE (IAT) SENSOR

Disconnect Intake Air Temperature (IAT) sensor connector. IAT sensor is located in intake plenum. IAT sensor can be identified by sensor body being threaded into intake plenum. Using a DVOM, measure resistance between IAT sensor terminals. See INTAKE AIR TEMPERATURE (IAT) SENSOR RESISTANCE table.

INTAKE AIR TEMPERATURE (IAT) SENSOR RESISTANCE

THROTTLE POSITION (TP) SENSOR

1. Turn ignition off. Disconnect Throttle Position (TP) sensor connector. Using a DVOM, measure resistance between TP sensor connector terminals No. 1 and 3. (Scheme 80) Resistance should be 3.5-6.5 ohms. If resistance is within specification, go to next step. If resistance is not within specification, replace TP sensor.
2. Using a DVOM, measure resistance between TP sensor connector terminals No. 2 and 3. (Scheme 80) While observing DVOM, slowly open throttle to Wide Open Throttle (WOT). Resistance should change smoothly. If resistance does not change smoothly, replace TP sensor. If resistance changes smoothly, TP sensor is functioning properly.

Scheme 80

IDLE AIR CONTROL (IAC) MOTOR

Turn ignition off. Disconnect Idle Air Control (IAC) motor connector. Using a DVOM, measure resistance between IAC motor connector terminals No. 1 and 4, then between terminals No. 2 and 3. (Scheme 81) See IDLE AIR CONTROL (IAC) MOTOR RESISTANCE table. If resistance is within specification, IAC motor is okay. If resistance is not within specification, replace IAC motor.

IDLE AIR CONTROL (IAC) MOTOR RESISTANCE

Scheme 81

MULTI-POINT FUEL INJECTION (MFI) & FUEL PUMP RELAYS

Note. Multi-Point Fuel Injection (MFI) relay is also identified as Auto Shutdown (ASD) relay in TESTS W/CODES - NON-TURBO article.

1. Remove Multi-Point Fuel Injection (MFI) or fuel pump relay. Using a DVOM, measure resistance between relay terminals No. 4 and 6. (Scheme 82) Resistance should be 35-75 ohms. If resistance is within specification, go to next step. If resistance is not within specification, replace relay.
2. Using a jumper wire, connect relay terminal No. 6 to positive battery terminal. Using another jumper wire, connect relay terminal No. 4 to negative battery terminal. (Scheme 82)
3. Relay should activate. When relay activates, DVOM should display continuity between relay terminals No. 2 and 8. If relay activated and DVOM displayed continuity, relay is functioning properly. If relay did not activate or DVOM did not display continuity, replace relay.
4. Disconnect jumper wire from battery negative terminal. Relay should de-energize. DVOM should show infinity. If DVOM displays infinity, relay is functioning properly. If DVOM does not display infinity, replace relay.

Scheme 82

Electric EGR Transducer Solenoid

1. Disconnect electric EGR transducer solenoid valve electrical connector and vacuum hoses. Identify vacuum hoses for reassembly. Electric EGR transducer solenoid valve is located next to air intake ducting in engine compartment. (Scheme 83)
2. Plug electric EGR transducer solenoid valve nipple "A". Connect a hand-held vacuum pump to electric EGR transducer solenoid valve hose vacuum nipple "B". (Scheme 84) Connect a positive pressure type hand-held pump to electric EGR transducer solenoid valve nipple "C". (Scheme 84)
3. Using jumper wires, connect electric EGR transducer solenoid valve to battery voltage. With battery voltage applied to solenoid valve, apply positive pressure to solenoid valve nipple "C". (Scheme 84) Apply vacuum to solenoid valve nipple "B". Vacuum should leak. If vacuum leaks, go to next step. If vacuum does not leak, replace electric EGR transducer solenoid valve.
4. Release positive pressure from solenoid valve nipple "C". With battery voltage still applied, apply vacuum to solenoid valve nipple "B". (Scheme 84) Vacuum should hold. If vacuum holds, go to next step. If vacuum does not hold, replace electric EGR transducer solenoid valve.
5. Disconnect jumper wire from battery. Apply vacuum to solenoid valve nipple "B". (Scheme 84) Vacuum should hold. If vacuum holds, go to next step. If vacuum does not hold, replace electric EGR transducer solenoid valve.
6. Using a DVOM, measure resistance across electric EGR transducer solenoid valve terminals. See ELECTRIC EGR TRANSDUCER SOLENOID VALVE RESISTANCE table. If resistance is not within specification, replace electric EGR transducer solenoid valve. If resistance is within specification, electric EGR transducer solenoid valve is functioning properly.

ELECTRIC EGR TRANSDUCER SOLENOID VALVE RESISTANCE

Scheme 83

Scheme 84

Scheme 85

1. Disconnect evaporative emission purge solenoid valve electrical connector and vacuum hoses. Identify vacuum hoses for reassembly. Evaporative emission purge solenoid is located near evaporative emission canister. (Scheme 85)
2. Connect a hand-held vacuum pump to evaporative emission purge solenoid valve hose vacuum nipple "A". (Scheme 86) Apply vacuum to solenoid. Vacuum should hold. If vacuum holds, go to next step. If vacuum does not hold, replace evaporative emission purge solenoid valve.
3. Using jumper wires, connect evaporative emission purge solenoid valve to battery voltage. With battery voltage applied to solenoid valve, apply vacuum to solenoid valve nipple "A". (Scheme 86) Vacuum should leak. If vacuum leaks, go to next step. If vacuum does not leak, replace evaporative emission purge solenoid valve.
4. Using a DVOM, measure resistance across evaporative emission purge solenoid valve terminals. See EVAPORATIVE EMISSION PURGE SOLENOID VALVE RESISTANCE table. If resistance is not within specification, replace evaporative emission purge solenoid valve. If resistance is within specification, evaporative emission purge solenoid valve is functioning properly.

EVAPORATIVE EMISSION PURGE SOLENOID VALVE RESISTANCE

Scheme 86

INJECTORS

Turn ignition off. Disconnect injector electrical connector. Using a DVOM, measure resistance across injector terminals. See INJECTOR RESISTANCE table. If resistance is within specification, injector coils are okay. If resistance is not within specification, replace injector.

INJECTOR RESISTANCE

IGNITION SYSTEM

Note. For basic ignition checks, see BASIC TESTING - NON-TURBO article.

EVAPORATIVE EMISSION CONTROL

1. Disconnect purge control vacuum hose from throttle body. (Scheme 87) Connect a hand-held vacuum pump to purge control vacuum hose. Plug vacuum nipple on throttle body. Ensure engine is at operating temperature.
2. Turn engine off. Start engine and let it idle. Right after starting engine, apply 16 in. Hg vacuum to purge control vacuum hose. Vacuum should be maintained. If vacuum is maintained, go to next step. If vacuum is not maintained, repair evaporative emission system.
3. With engine idling at operating temperature for 10 minutes or more, apply 16 in. Hg vacuum to purge control vacuum hose. Vacuum should leak. If vacuum leaks, go to next step. If vacuum does not leak, repair evaporative emission system.
4. Remove plug from nipple on throttle body. Connect a hand-held vacuum pump to nipple on throttle body. Start engine. Raise engine speed and observe vacuum gauge. Vacuum should remain constant regardless of engine speed. If vacuum remains constant regardless of engine speed, evaporative emission system is functioning properly. If no vacuum is generated, clean clogged throttle body vacuum port.

Scheme 87

EXHAUST GAS RECIRCULATION (EGR) SYSTEM

1. Inspect hose connections between intake manifold, EGR solenoid and transducer, and EGR valve. Replace hardened, cracked and damaged hoses.
2. Ensure engine coolant temperature is more than 170°F (77°C). Put transmission in Neutral. Allow engine to idle for approximately 70 seconds. Suddenly accelerate engine to approximately 2000 RPM, but not more than 3000 RPM. EGR valve stem should move when accelerating engine. Repeat test several times to confirm EGR valve stem movement.
3. If EGR valve stem moves, EGR control system if functioning properly, go to next step. If EGR valve stem does not move, verify EGR solenoid operation. See «SOLENOIDS»(ref-11336-S15746886552000111300000) under MOTORS, RELAYS & SOLENOIDS. After verifying solenoid operation, go to next step.
4. With engine idling at operating temperature, slowly apply vacuum to EGR valve. When vacuum reaches approximately 3.5 in. Hg, engine idle will become rough or engine may stall. If engine idle does not become rough or engine does not stall, go to next step. If engine idle becomes rough or engine stalls, EGR system is functioning properly.
5. Turn engine off. Remove EGR valve from vehicle. Connect a hand-held vacuum pump to EGR valve. Apply 20 in. Hg to EGR valve. If vacuum is maintained, go to next step. If vacuum is not maintained, replace EGR valve.
6. Apply 1.6 in. Hg or less to EGR valve. Air should not pass through EGR passages. If air does not pass through EGR passages, go to next step. If air passes through EGR passages, replace EGR valve.
7. Apply 8.7 in. Hg or more to EGR valve. Air should pass through EGR passages. If air passes through EGR passages, go to next step. If air does not pass through EGR passages, replace EGR valve.
8. Remove EGR vacuum hose from intake manifold. Connect a vacuum gauge to intake manifold nipple. Start engine. Gradually raise engine speed and observe vacuum gauge. Vacuum signal should remain fairly constant. If vacuum signal remains fairly constant, EGR system is functioning properly. If vacuum signal is not fairly constant, inspect intake manifold inlet passage. Repair or replace components as necessary.

PCV Valve

Disconnect hose from PCV valve. Remove PCV valve from valve cover. Reconnect hose to PCV valve. Start engine and let idle. Put finger over opening of PCV valve. Ensure a vacuum is felt with finger. If vacuum is not felt, clean or replace PCV valve as necessary.