Engine (Diagnostics) (H4SO): Other Subaru Baja I

AUTOMATIC TRANSMISSION

When trouble code about automatic transmission is known on display, carry out the following basic check. After that, carry out the replacement or repair work.

1. ATF level check; Refer to «AUTOMATIC TRANSMISSION FLUID»(ref-208395-S35776238372005120700000) .
2. Differential gear oil level check; Refer to «DIFFERENTIAL GEAR OIL»(ref-208395-S12578962472005120700000) .
3. ATF leak check; Refer to «AUTOMATIC TRANSMISSION FLUID»(ref-208395-S35776238372005120700000) .
4. Differential gear oil leak check; Refer to «DIFFERENTIAL GEAR OIL»(ref-208395-S12578962472005120700000) .
5. Stall test; Refer to «STALL TEST»(ref-208395-S11949561822005120700000) .
6. Line pressure test; Refer to «LINE PRESSURE TEST»(ref-208395-S40911946302005120700000) .
7. Transfer clutch pressure test; Refer to «TRANSFER CLUTCH PRESSURE TEST»(ref-208395-S31220221542005120700000) .
8. Time lag test; Refer to «TIME LAG TEST»(ref-208395-S14924596762005120700000) .
9. Road test; Refer to «ROAD TEST»(ref-208395-S41651055592005120700000) .
10. Shift characteristics; Refer to «TRANSFER CLUTCH PRESSURE TEST»(ref-208395-S31220221542005120700000) .

CHECK LIST NO. 1

Check the following items when problem has occurred.

Note. Use copies of this page for interviewing customers.

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CHECK LIST NO. 2

Check the following items about the vehicle's state when MIL turns on.

Note. Use copies of this page for interviewing customers.

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1. Airbag system wiring harness is routed near the engine control module (ECM), main relay and fuel pump relay. CAUTION: All Airbag system wiring harness and connectors are colored yellow. Do not use electrical test equipment on these circuit. Be careful not to damage Airbag system wiring harness when servicing the engine control module (ECM), transmission control module (TCM), main relay and fuel pump relay.
2. Never connect the battery in reverse polarity. The ECM will be destroyed instantly. The fuel injector and other part will be damaged in just a few minutes more.
3. Do not disconnect the battery terminals while the engine is running. A large counter electromotive force will be generated in the alternator, and this voltage may damage electronic parts such as ECM, etc.
4. Before disconnecting the connectors of each sensor and the ECM, be sure to turn OFF the ignition switch.
5. Poor contact has been identified as a primary cause of this problem. To measure the voltage and/or resistance of individual sensors of all electrical control modules at the harness side connector, use a tapered pin with a diameter of less than 0.64 mm (0.025 in). Do not insert the pin more than 5 mm (0.20 in) into the part.
6. Before removing ECM from the located position, disconnect two cables on battery. Otherwise, the ECM may be damaged. CAUTION: When replacing ECM, be careful not to use the wrong spec. ECM to avoid any damage on fuel injection system.
7. The connectors to each sensor in the engine compartment and the harness connectors on the engine side and body side are all designed to be waterproof. However, it is still necessary to take care not to allow water to get into the connectors when washing the vehicle, or when servicing the vehicle on a rainy day.
8. Use ECM mounting stud bolts at the body head grounding point when measuring voltage and resistance inside the passenger compartment.
9. Use engine grounding terminal or engine proper as the grounding point to the body when measuring voltage and resistance in the engine compartment.
10. Use TCM mounting stud bolts at the body head grounding point when measuring voltage and resistance inside the passenger compartment.
11. Every MFI-related part is a precision part. Do not drop them.
12. Observe the following cautions when installing a radio in MFI equipped models. CAUTION: The antenna must be kept as far apart as possible from the control unit. (The ECM is located under the steering column, inside of the instrument panel lower trim panel.) The antenna feeder must be placed as far apart as possible from the ECM and MFI harness. Carefully adjust the antenna for correct matching. When mounting a large power type radio, pay special attention to the three items above mentioned. Incorrect installation of the radio may affect the operation of the ECM.
13. Before disconnecting the fuel hose, disconnect the fuel pump connector and crank the engine for more than five seconds to release pressure in the fuel system. If engine starts during this operation, run it until it stops.
14. Problems in the electronic-controlled automatic transmission may be caused by failure of the engine, the electronic control system, the transmission proper, or by a combination of these. These three causes must be distinguished clearly when performing diagnostics.
15. Diagnostics should be conducted by rotating with simple, easy operations and proceeding to complicated, difficult operations. The most important thing in diagnostics is to understand the customer's complaint, and distinguish between the three causes.
16. In AT vehicles, do not continue the stall for more than five seconds at a time (from closed throttle, fully open throttle to stall engine speed).
17. On ABS vehicle, when performing driving test in jacked-up or lifted-up position, sometimes the warning light may be lit, but this is not a malfunction of the system. The reason for this is the speed difference between the front and rear wheels. After diagnosis of engine control system, perform the ABS memory clearance procedure of self-diagnosis system.

BATTERY

1. Measure battery voltage and specific gravity of electrolyte. Standard voltage: 12 V Specific gravity: Above 1.260
2. Check the condition of the main and other fuses, and harnesses and connectors. Also check for proper grounding.

ENGINE GROUNDING

Make sure the engine grounding terminal is properly connected to the engine.

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ENGINE AND EMISSION CONTROL SYSTEM

1. The Multipoint Fuel Injection (MFI) system is a system that supplies the optimum air-fuel mixture to the engine for all the various operating conditions through the use of the latest electronic technology. With this system fuel, which is pressurized at a constant pressure, is injected into the intake air passage of the cylinder head. The injection quantity of fuel is controlled by an intermittent injection system where the electro-magnetic injection valve (fuel injector) opens only for a short period of time, depending on the quantity of air required for one cycle of operation. In actual operation, the injection quantity is determined by the duration of an electric pulse applied to the fuel injector and this permits simple, yet highly precise metering of the fuel.
2. Further, all the operating conditions of the engine are converted into electric signals, and this results in additional features of the system, such as large improved adaptability, easier addition of compensating element, etc. The MFI system also has the following features

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1. Reduced emission of harmful exhaust gases.
2. Reduced in fuel consumption.
3. Increased engine output.
4. Superior acceleration and deceleration.
5. Superior startability and warm-up performance in cold weather since compensation is made for coolant and intake air temperature.

AUTOMATIC TRANSMISSION AND ELECTRONIC-HYDRAULIC CONTROL SYSTEM

The electronic-hydraulic control system consist of various sensors and switches, a transmission control module (TCM) and the hydraulic controller including solenoid valves. The system controls the transmission proper including shift control, lock-up control overrunning clutch control, line pressure control and shift timing control. It also controls the AWD transfer clutch. In other words, the system detects various operating conditions from various input signals and sends output signals to shift solenoids 1, 2 and low clutch timing solenoid and 2-4 brake timing solenoid, line pressure duty solenoid, lock-up duty solenoid, transfer duty solenoid and 2-4 brake duty solenoid (a total of eight solenoids).

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1. MODULE
2. SENSOR
3. SOLENOID VALVE, EMISSION CONTROL SYSTEM PARTS AND IGNITION SYSTEM PARTS

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1. MODULE
2. SENSOR
3. SOLENOID VALVE AND SWITCH (AT VEHICLES)
4. SOLENOID VALVE AND SWITCH (MT VEHICLES)

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Measuring condition

1. After warm-up the engine.
2. Gear position is in "N" or "P" position.
3. A/C is turned OFF.
4. All accessory switches are turned OFF.

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Note. Check with ignition switch ON.

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1. This connector is used both for OBD-II general scan tools and the Subaru Select Monitor.
2. Terminal No. 4 to No. 6 of the data link connector is used for the Subaru Select Monitor signal. CAUTION: Do not connect any scan tools other than the OBD-II general scan tools and the Subaru Select Monitor, because the circuit for the Subaru Select Monitor may be damaged.

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1. Prepare a general scan tool (OBD-II general scan tool) required by SAE J1978.
2. Open the cover and connect the OBD-II general scan tool to the data link connector (A) located in the lower portion of the instrument panel (on the driver's side).
3. Using the OBD-II general scan tool, call up diagnostic trouble code(s) and freeze frame data. OBD-II general scan tool functions consist of: MODE $01: Current powertrain diagnostic data MODE $02: Powertrain freeze frame data MODE $03: Emission-related powertrain diagnostic trouble codes MODE $04: Clear/Reset emission-related diagnostic information Read out data according to repair procedures. (For detailed operation procedures, refer to the OBD-II General Scan Tool Operation Manual. NOTE: For details concerning diagnostic trouble codes, refer to the List of Diagnostic Trouble Code (DTC). Refer to «LIST OF DIAGNOSTIC TROUBLE CODE (DTC)»(ref-208365-S37793840062005120700000) .

MODE $02 (POWERTRAIN FREEZE FRAME DATA)

Refers to data denoting the operating condition when trouble is sensed by the on-board diagnosis system. list of the support data and PID (Parameter Identification) codes are shown in the following table.

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Note. Refer to OBD-II general scan tool manufacturer's instruction manual to access freeze frame data (MODE $02).

SUBARU SELECT MONITOR (NORMAL MODE)

1. On the << Main Menu >> display screen, select the {Each System Check} and press the [YES] key.
2. On the << System Selection Menu >> display screen, select the {Engine Control System} and press the [YES] key.
3. Press the [YES] key after displayed the information of engine type.
4. On the << Engine Diagnosis >> display screen, select the {Diagnostic Code(s) Display} and press the [YES] key.
5. On the << Diagnostic Code(s) Display >> display screen, select the {Current Diagnostic Code(s)} or {History Diagnostic Code(s)} and press the [YES] key. NOTE: For detailed operation procedure, refer to the Subaru Select Monitor Operation Manual. For detailed concerning diagnostic trouble codes, refer to the List of Diagnostic Trouble Code DTC). Refer to «LIST OF DIAGNOSTIC TROUBLE CODE (DTC)»(ref-208365-S37793840062005120700000) .

SUBARU SELECT MONITOR (OBD MODE)

1. On the << Main Menu >> display screen, select the {Each System Check} and press the [YES] key.
2. On the << System Selection Menu >> display screen, select the {Engine Control System} and press the [YES] key.
3. Press the [YES] key after displayed the information of engine type.
4. On the << Engine Diagnosis >> display screen, select the {OBD System} and press the [YES] key.
5. On the << OBD Menu >> display screen, select the {Diagnosis Code(s) Display} and press the [YES] key.
6. Make sure that a diagnostic trouble code (DTC) is shown on the display screen. NOTE: For detailed operation procedure, refer to the Subaru Select Monitor Operation Manual. For detailed concerning diagnostic trouble codes, refer to the List of Diagnostic Trouble Code DTC). Refer to «LIST OF DIAGNOSTIC TROUBLE CODE (DTC)»(ref-208365-S37793840062005120700000) .

PREPARATION FOR THE DRIVE CYCLE

1. Make sure that fuel remains approx. half amount [20 to 40 l (5.3 - 10.6 US gal, 4.4 - 8.8 lmp gal)], and battery voltage is 12V or more.
2. After performing diagnostics and cleaning the memory, check for any remaining unresolved trouble data. Refer to «CLEAR MEMORY MODE»(ref-208365-S09915749072005120700000) .
3. Separate test mode connector. NOTE: Except for water temperature specified items at starting, diagnosis is carried out after engine warm up. Carry out diagnosis which is marked* on DTC twice, Then, after finishing 1st diagnosis, stop engine and do the second time at the same condition.

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IDLE FOR 10 MINUTES

Note. Therefore diagnosis, drive vehicle at 4 km/h (6 MPH) or more.

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1. On the << Main Menu >> display screen, select the {Each System Check} and press the [YES] key.
2. On the << System Selection Menu >> display screen, select the {Engine Control System} and press the [YES] key.
3. Press the [YES] key after displayed the information of engine type.
4. On the << Engine Diagnosis >> display screen, select the {Clear Memory} and press the [YES] key.
5. When the `Done' and `Turn Ignition Switch OFF' are shown on the display screen, turn the Subaru Select Monitor and ignition switch to OFF. NOTE: After the memory has been cleared, the ISC must be initialized. To do this, turn the ignition switch to the ON position. Wait 3 seconds before starting the engine. (AT vehicles only). For detailed operation procedure, refer to the Subaru Select Monitor Operation Manual.

1. On the << Main Menu >> display screen, select the {2. Each System Check} and press the [YES] key.
2. On the << System Selection Menu >> display screen, select the {Engine Control System} and press the [YES] key.
3. Press the [YES] key after displayed the information of engine type.
4. On the << Engine Diagnosis >> display screen, select the {OBD System} and press the [YES] key.
5. On the << OBD Menu >> display screen, select the {4. Diagnosis Code(s) Cleared} and press the [YES] key.
6. When the `Clear Diagnostic Code?' is shown on the display screen, press the [YES] key.
7. Turn Subaru Select Monitor and ignition switch to OFF. NOTE: After the memory has been cleared, the idle air control solenoid valve must be initialized. To do this, turn the ignition switch to the ON position. Wait 3 seconds before starting the engine. For detailed operation procedure, refer to the Subaru Select Monitor Operation Manual.

STARTER MOTOR CIRCUIT

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1. WIRING DIAGRAM

CONTROL MODULE POWER SUPPLY AND GROUND LINE

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1. WIRING DIAGRAM

IGNITION CONTROL SYSTEM

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1. WIRING DIAGRAM

FUEL PUMP CIRCUIT

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1. WIRING DIAGRAM

FUEL INJECTOR CIRCUIT

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1. WIRING DIAGRAM

Note. Check general diagnostics table with non-conformity symptom for automatic transmission. Refer to BASIC DIAGNOSTIC PROCEDURE .