Engine Controls - Self-Diagnostics - 3.0L: Other Mitsubishi Eclipse III

Malfunction Indicator Light

MIL may also be referred to as SERVICE ENGINE SOON light. If all systems are normal, immediately after ignition switch is turned to ON position, MIL will illuminate for 5 seconds, then go out. When ECM/PCM determines an emission system related malfunction exists, ECM/PCM will turn the MIL on. If ECM/PCM determines that the malfunction no longer exists, it will turn the MIL off.

If MIL will not come on for bulb check or MIL stays on with no DTCs present, diagnose MIL circuit malfunction. See MALFUNCTION INDICATOR LIGHT DIAGNOSIS .

Freeze Frame Data

The conditions at the time a malfunction is detected will be stored in ECM/PCM as freeze frame data. While multiple DTCs may be recorded, only one freeze frame is recorded. DTCs are assigned a priority with fuel and misfire codes having the highest priority. Non-emission system related DTCs have the lowest priority. The DTC with the highest priority will be the one recorded in freeze frame. Freeze frame records are cleared when DTCs are erased. Freeze frame data recorded is

1. Engine Coolant Temperature
2. Engine RPM
3. Vehicle Speed
4. Long Term Fuel Trim (Displayed As Percent)
5. Short Term Fuel Trim (Displayed As Percent)
6. Fuel Control Condition (Open Or Closed Loop)
7. Calculated Load Value (Displayed As Percent)
8. DTC During Data Recording

OBD-II Drive Cycles

Manufacturer defines drive cycle as a pattern of driving that meets code set criteria for ECM/PCM to monitor a particular system/component. Drive cycle is used to verify repair by reproducing conditions during which fault occurred. There are 6 different drive cycles. These are

1. Catalytic Converter Monitor
2. Evaporative Emission Control System Leak Monitor
3. Exhaust Gas Recirculation Monitor
4. Fuel Trim Monitor
5. Heated Oxygen Sensor Monitor
6. Other Monitor

Note. DO NOT run drive cycle if outside air temperature is less than 14°F (-10°C).

For the requirements to run a drive cycle, see appropriate drive cycle in OBD-II DRIVE CYCLES under VERIFYING REPAIRS.

Failure Management

When main sensor malfunctions are detected, ECM/PCM will enter fail-safe mode. Default values will be substituted in ECM/PCM calculations for faulty sensor as follows

1. Barometric Pressure (BARO) Sensor Sets At A Default Of 30 In. Hg (101 kPa)
2. Camshaft Position (CMP) Sensor ECM/PCM Will Command Injectors To Inject Fuel Into All Cylinders Simultaneously
3. Communication Line With Transaxle Control CPU No Ignition Timing Retard Control Achieved When Transaxle Speeds Change
4. Engine Coolant Temperature (ECT) Sensor Sets At A Default Of 176°F (80°C)
5. Generator FR Terminal Does Not Restrict Generator Output With Respect To Electrical Load
6. Heated Oxygen Sensor (HO2S) Front Air/Fuel Ration Closed Loop Control Is Not Performed
7. Heated Oxygen Sensor (HO2S) Rear Performs Closed Loop Control Of Air/Fuel Ration By Using Front HO2S Signals
8. Intake Air Temperature (IAT) Sensor Sets At A Default Of 77°F (25°C)
9. Knock Sensor Switches Ignition Timing From High Octane Fuel To Ignition Timing For Standard Octane Fuel
10. Misfire Detection ECM/PCM Stops Supplying Fuel To The Cylinder With The Highest Misfiring Rate If A Misfire That Could Damage The Catalytic Converter Is Detected
11. Throttle Position (TP) Sensor Fuel Injection Amount Will Not Increase During Acceleration Due To Unreliable Tp Sensor Signal
12. Volume Airflow (VAF) Sensor ECM/PCM Will Use Crankshaft Position (CKP) Sensor Signal (Engine Speed) & Throttle Position (TP) Sensor Signal To Determine Injector Drive Time & Basic Ignition Timing For The Pre-Set Mapping. Idle Air Control (IAC) Motor Remains In A Fixed Position

Hard Failures

Hard failures cause MIL to illuminate and remain on until problem is repaired. If MIL comes on and remains on (light may flash) during vehicle operation, cause of malfunction must be determined by retrieving DTCs. See ENTERING ON-BOARD DIAGNOSTICS . If a sensor fails, ECM/PCM will use a substitute value in its calculations to continue engine operation. In this condition, commonly known as limp-in mode, vehicle runs but driveability will not be optimum.

SERVICE PRECAUTIONS

Before proceeding with diagnosis, following precautions must be observed

1. Ensure vehicle has a fully charged battery and functional charging system. DTCs cannot be retrieved if battery voltage is too low.
2. Visually inspect connectors and circuit harness being worked on.
3. DO NOT disconnect battery or ECM/PCM. This will erase any DTCs stored in ECM/PCM memory.
4. DO NOT cause short circuits when performing electrical tests. This will set additional DTCs, making diagnosis of original problem more difficult.
5. DO NOT use a test light in place of a voltmeter. Use voltmeter with 10-megohm impedance.
6. When checking for spark, ensure coil wire is NOT more than 1/4" from chassis ground. If coil wire is more than 1/4" from chassis ground, damage to vehicle electronics and/or ECM/PCM may result.
7. DO NOT prolong testing of fuel injectors. Engine may hydrostatically (liquid) lock.

Function Selection

1. Turn ignition switch to LOCK position. Connect scan tool to DLC. see scheme 11 Turn ignition switch to ON position.
2. From immobilizer menu, select SPECIAL FUNCTION. To register key identification (encrypted code), see «KEY ID REGISTER (ENCRYPTED CODE REGISTRATION)»(ref-135484-S00770415682002120500000). To change immobilizer system password, see «PASSWORD SET»(ref-135484-S29042247092002120500000).
3. After registration procedure, turn ignition switch to LOCK position and leave off for at least 10 seconds. Ensure each ignition key can start engine. Ensure immobilizer and ECM/PCM DTCs do not reset. Ensure ignition switch is in LOCK position before disconnecting scan tool.

Key ID Register (Encrypted Code Registration)

Note. Using key ID register function will erase all key IDs (encrypted codes) that have been previously registered in immobilizer-ECU. All keys (8 maximum) need to be registered and should be available during procedure. DO NOT disconnect scan tool halfway through registration process. After registering key IDs, ensure all registered keys will start engine.

1. Turn ignition switch to LOCK position. Obtain 4-digit password from vehicle owner. Connect scan tool to DLC. See «FUNCTION SELECTION»(ref-135484-S33355867442002120500000) . From special function menu, select KEY ID REGISTR. Using left, right, up and down keys, enter 4-digit password obtained from vehicle owner. After entering password, press "Y" key.
2. If wrong password is input 5 times in a row, scan tool screen will display CAN'T EXECUTE FOR 20 MIN. DUE TO WRONG PASSWORD. Immobilizer-ECU will switch to start-prevention mode.
3. If immobilizer system accepts password, insert key to be registered in ignition switch. Turn ignition switch to ON position. Press "Y" to start key ID registration. When key registration is successful, scan tool screen will display COMPLETED. If error occurs during key ID registration, scan tool screen will display CAN'T EXECUTE. See TEST NO. 2: REGISTERING IGNITION KEY NOT POSSIBLE under SYSTEM TESTS in IMMOBILIZER SYSTEMS - ECLIPSE article. If key has already been registered, scan tool screen will display KEY ID HAS BEEN REGISTERED.
4. The number of keys currently registered will be displayed on scan tool screen. To register an additional key, replace ignition key with next key to be registered within 5 seconds and press "Y" key. Continue registering keys up to a maximum of 8 keys. After last key is registered, press "N" key.

Password Set

Note. Password must be 4 digits. Each digit must be a value from zero to 9. After password is changed, ensure vehicle owner gets a copy of NEW 4-digit password.

1. Obtain password from vehicle owner. Turn ignition switch to LOCK position. Connect scan tool to DLC. See «FUNCTION SELECTION»(ref-135484-S33355867442002120500000) . From special function menu, select PASSWORD SET. Enter current 4-digit password. Using up and down keys, enter password digit from zero to 9. Using left and right keys, move to next password digit. When password is entered, press "Y" key.
2. If wrong password is input 5 times in a row, scan tool screen will display CAN'T EXECUTE FOR 20 MIN. DUE TO WRONG PASSWORD. Immobilizer-ECU will switch to start-prevention mode.
3. If correct password is entered, screen will display PLEASE ENTER A NEW PASSWORD. Enter new 4-digit password as described in step 1 . After new password is entered, press "Y" key.
4. If new password is successfully registered, scan tool screen will display COMPLETED. If new password is not successfully registered, scan tool screen will display CAN'T EXECUTE.

MALFUNCTION INDICATOR LIGHT WILL NOT COME ON FOR BULB CHECK

Note. If ECM/PCM is replaced, immobilizer code registration must be performed. See PROGRAMMING .

MALFUNCTION INDICATOR LIGHT STAYS ON

Note. If ECM/PCM is replaced, immobilizer code registration must be performed. See PROGRAMMING .

NO COMMUNICATION WITH ENGINE CONTROL MODULE/POWERTRAIN CONTROL MODULE

Note. If ECM/PCM is replaced, immobilizer code registration must be performed. See PROGRAMMING .

VERIFYING REPAIRS

Note. Erasing DTCs will also erase freeze frame data and reset readiness test status.

Procedure for verifying repairs depends on scan tool functions and whether DTC is set by one-trip or two-trip fault detection logic. Two-trip fault detection logic requires fault be detected on 2 consecutive drive cycles, which each meet code set criteria, before DTC will set and MIL will illuminate. DTCs using one-trip fault detection logic set DTC the first time fault is detected. If fault is emission system related, ECM/PCM will also turn on MIL. Most DTCs use two-trip fault detection logic. To determine which logic is used to set DTC, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . Then, go to appropriate repair verification procedure.

VERIFYING REPAIRS FOR ONE-TRIP DTCS

Record freeze frame data. Clear DTCs. Drive vehicle in manner approximating conditions recorded in freeze frame in order to verify repair. Using scan tool, check for DTCs.

VERIFYING REPAIRS FOR TWO-TRIP DTCS

For catalytic converter, EGR, Evaporative Emission (EVAP) system, fuel trim and Heated Oxygen Sensor (HO2S) related DTCs, it will be necessary to drive vehicle according to drive cycle that allows ECM/PCM to monitor the fault. Clear DTCs and drive vehicle according to appropriate monitor. See appropriate monitor under OBD-II DRIVE CYCLES .

If drive cycle used to verify repair runs catalytic converter monitor, HO2S monitor, EGR monitor, fuel trim monitor or EVAP system leak monitor, repair may be verified in one drive cycle by checking readiness test status. Readiness test status is an indicator showing whether monitor has run or not run. If ECM/PCM ran monitor and found no faults, readiness test status will display COMPLETE or READY. Repair is verified.

If ECM/PCM found fault during drive cycle or monitor did not meet criteria to run, readiness test status will display INCOMPLETE or NOT READY. Perform drive cycle again. The second time drive cycle is run, readiness test status will display COMPLETE or READY whether or not a fault was found. It will be necessary to check for DTCs. If readiness test status does not display COMPLETE or READY after 2 drive cycles, one or both drive cycles failed to meet criteria necessary for ECM/PCM to run monitor.

For systems and components monitored by other monitor, record freeze frame data. Clear DTCs. Drive vehicle in manner approximating conditions recorded in freeze frame in order to verify repair.

Other monitor does not have readiness test status because other monitor runs continuously. Manufacturer's MUT-II Scan Tool (MB991502) provides mode 2 (increased sensitivity) and mode 5 (provisional DTCs) functions which allow repairs to be verified after one drive cycle. Generic scan tools may or may not have these functions. If scan tool does not have these functions, drive vehicle under conditions approximating freeze frame data twice, then check for DTCs.

MUT-II scan tool mode 2 (increased sensitivity) allows single drive cycle testing of emissions related DTCs. Mode 2 commands ECM/PCM to illuminate MIL and set DTC on first occurrence of fault when code set criteria are being met. If MIL does not illuminate during drive cycle, repair is verified. Return to mode 1 (normal) by turning ignition switch to LOCK position or re-selecting mode 1. When scan tool returns to mode 1, freeze frame data, readiness test status and DTCs are erased.

MUT-II scan tool mode 5 (provisional DTCs) can be used to verify repairs after only one drive cycle by reporting fault as provisional (pending) DTC. Mode 5 is limited to reporting faults related to misfire, fuel system and faults detected by other monitor.

Note. DO NOT run drive cycle if outside air temperature is less than 14°F (-10°C).

There are 6 different drive cycles. These are

1. «CATALYTIC CONVERTER MONITOR»(ref-135484-S22499384332002022200000)
2. «EVAPORATIVE EMISSION CONTROL SYSTEM LEAK MONITOR»(ref-135484-S17250566142002022200000)
3. «EXHAUST GAS RECIRCULATION MONITOR»(ref-135484-S32355179932002022200000)
4. «FUEL TRIM MONITOR»(ref-135484-S06995383792002022200000)
5. «HEATED OXYGEN SENSOR MONITOR»(ref-135484-S15606817862002022200000)
6. «OTHER MONITOR»(ref-135484-S33802843322002022200000)

Catalytic Converter Monitor

This monitor applies to DTCs P0421 and P0431. Following conditions must be met during the test

1. Atmospheric Temperature Is 14°F (-10°C) Or More
2. A/C Switch Is In OFF Position
3. Selector Lever Is In "D" Range

Note. Remove all test equipment from vehicle and install all components and connectors that were removed or disconnected during testing.

Monitor takes about 20 minutes to complete. To run monitor, use illustration. (Scheme 94) This monitor must be performed twice. Perform steps as follows

1. Start the engine.
2. Accelerate vehicle to 45 MPH.
3. Travel 300 seconds or more while keeping speed at 45-60 MPH (5th gear on M/T).
4. Decelerate to 35-40 MPH.
5. While keeping accelerator pedal opening degree constant, keep vehicle speed at 35-40 MPH for 90 seconds or more (this is when monitor runs).
6. Fully close throttle and decelerate for 10 seconds. Then, quickly accelerate until speed is 35-40 MPH. Then repeat steps 5 and 6 five more times.
7. Return vehicle to shop and turn ignition switch to LOCK position.
8. Recheck for DTCs. If DTC P0421 or P0431 resets, return to appropriate diagnostic procedure under «DIAGNOSTIC TESTS»(ref-135484-S04231589802002022200000) .

Scheme 94

Evaporative Emission Control System Leak Monitor

This monitor applies to DTCs P0441, P0442, P0451, P0452, P0453, P0455 and P0456. Following conditions must be met during the test

1. Engine Coolant Temperature Is 86°F (30°C) Or Less With Engine Stopped Before Test Drive
2. Atmospheric Temperature Is 41-113°F (5-45°C)
3. Selector Lever Is In "D" Range
4. Test May Not Run If Fuel Tank Is Over 2/3 Full

Note. Remove all test equipment from vehicle and install all components and connectors that were removed or disconnected during testing.

Monitor takes about 8 minutes to complete. To run monitor, use illustration. (Scheme 95) This monitor must be performed twice. Perform steps as follows

1. Start the engine.
2. Accelerate vehicle to 55-60 MPH.
3. Travel 300 seconds or more while keeping vehicle speed at 55-60 MPH (5th gear on M/T).
4. While keeping accelerator pedal position constant, keep speed at 55-60 MPH for 150 seconds or more (this is when monitor runs).
5. Return vehicle to shop and turn ignition switch to LOCK position.
6. Recheck for DTCs. If DTC P0441, P0442, P0451, P0452, P0453, P0455 or P0456 resets, return to appropriate diagnostic procedure under «DIAGNOSTIC TESTS»(ref-135484-S04231589802002022200000) .

Scheme 95

Exhaust Gas Recirculation Monitor

This monitor applies to DTC P0401. Following conditions must be met during the test

1. Engine Coolant Temperature Is 176°F (80°C) Or More
2. Atmospheric Temperature Is 41°F (5°C) Or More
3. Selector Lever Is In "D" Range
4. A/C Switch Is In OFF Position

Note. Remove all test equipment from vehicle and install all components and connectors that were removed or disconnected during testing.

Monitor takes about 10 minutes to complete. To run monitor, use illustration. (Scheme 96) This monitor must be performed twice. Perform steps as follows

1. Start the engine and allow it to reach 176°F (80°C).
2. Accelerate vehicle to 35-45 MPH.
3. Travel 20 seconds or more while keeping vehicle speed at 35-40 MPH (4th gear on M/T).
4. Decelerate vehicle by closing throttle fully allowing engine speed to drop from 2000-3000 RPM to about 900 RPM. DO NOT apply brakes. DO NOT turn steering wheel or operate light switch during this time (this is when monitor runs).
5. Accelerate vehicle to 35-40 MPH, then hold speed constant for 20 seconds or more. Repeat steps 4 and 5 , seven more times.
6. Return vehicle to shop and turn ignition switch to LOCK position.
7. Recheck for DTCs. If DTC P0401 resets, return to «DTC P0401: EXHAUST GAS RECIRCULATION INSUFFICIENT FLOW DETECTED»(ref-135484-S12083693112002022200000) under DIAGNOSTIC TESTS.

Scheme 96

Fuel Trim Monitor

This monitor applies to DTCs P0171, P0172, P0174, and P0175. Following conditions must be met during the test

1. Engine Coolant Temperature Is 176-207°F (80-97°C)
2. Atmospheric Temperature Is 14-140°F (-10-60°C)
3. Selector Lever Is In "D" Range

Note. Remove all test equipment from vehicle and install all components and connectors that were removed or disconnected during testing.

Monitor takes about 35 minutes to complete. To run monitor, use illustration. (Scheme 97) This monitor must be performed twice. Perform steps as follows

1. Start the engine and allow it to reach 176°F (80°C).
2. Accelerate vehicle to 55-60 MPH.
3. Drive at 55-60 MPH for 30 minutes or more (5th gear on M/T). During this period DO NOT drive at constant speed for more than 120 seconds. Carry out one gradual deceleration and acceleration, returning to a vehicle speed of 55-60 MPH within a 120 second time frame (this is when monitor runs).
4. Return vehicle to shop and turn ignition switch to LOCK position.
5. Recheck for DTCs. If DTC P0171, P0172, P0744 or P0175 resets, return to appropriate diagnostic procedure under «DIAGNOSTIC TESTS»(ref-135484-S04231589802002022200000) .

Scheme 97

Heated Oxygen Sensor Monitor

This monitor applies to DTCs P0132, P0133, P0137, P0139, P0152, P0153, P0158, and P0159. Following conditions must be met during the test

1. Engine Coolant Temperature Must Be 176°F (80°C) Or More
2. Atmospheric Temperature Is 14°F (-10°C) Or More
3. Selector Lever Is In "D" Range

Note. Remove all test equipment from vehicle and install all components and connectors that were removed or disconnected during testing.

Monitor takes about 5 minutes to complete. To run monitor, use illustration. (Scheme 98) This monitor must be performed twice. Perform steps as follows

1. Start the engine and allow it to reach 176°F (80°C).
2. Accelerate vehicle to 35-40 MPH.
3. While keeping accelerator pedal position constant, keep vehicle speed at 35-40 MPH (4th gear on M/T) for 120 seconds or more (this is when monitor runs).
4. Return vehicle to shop and turn ignition switch to LOCK position.
5. Recheck for DTCs. If DTC P0132, P0133, P0137, P0139, P0152, P0153, P0158, or P0159 resets, return to appropriate diagnostic procedure under «DIAGNOSTIC TESTS»(ref-135484-S04231589802002022200000) .

Scheme 98

Other Monitor

This monitor applies to DTCs not covered by the rest of the monitors. Following conditions must be met during the test

1. Engine Coolant Temperature Must Be 176°F (80°C) Or More
2. Atmospheric Temperature Is 41°F (5°C) Or More
3. Selector Lever Is In "D" Range

Note. Remove all test equipment from vehicle and install all components and connectors that were removed or disconnected during testing.

Monitor takes about 10 minutes to complete. To run monitor, use illustration. (Scheme 99) Perform steps as follows

1. Start the engine and allow it to reach 176°F (80°C).
2. Accelerate vehicle to 35-40 MPH and travel for 300 seconds or more (4th gear on M/T).
3. Return vehicle to shop and allow engine to continue to idle. While engine is idling, A/C switch must be in OFF position, lights and accessories must be off, steering wheel must be straight ahead, and automatic transaxle must be in "P" range. After idling for 300 seconds, turn ignition switch to LOCK position.
4. Recheck for DTCs. If any DTC resets, return to appropriate diagnostic procedure under «DIAGNOSTIC TESTS»(ref-135484-S04231589802002022200000) .

Scheme 99

SUMMARY

If no there are no DTCs or provisional codes, and driveability symptoms exist, proceed to TROUBLE SHOOTING - NO CODES article for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.) or intermittent diagnostic procedures. See INTERMITTENT DIAGNOSTIC TROUBLE CODES under ON-BOARD DIAGNOSTICS under SELF-DIAGNOSTIC SYSTEM.