Diagnostic Strategy
Troubleshooting an electronically-controlled automatic transaxle is simplified by using the proven method of diagnosis. One of the most important things to remember is that there is a definite procedure to follow.
Note. Do not take short cuts or assume that critical checks or adjustments have already been made.
Follow the procedures as written to avoid missing critical components or steps.
To correctly diagnose a concern, have the following publications available
- Powertrain Control/Emissions Diagnosis (PC/ED) manual
- Technical Service Bulletins (TSBs)
- Wiring Diagrams
These publications provide the information required when diagnosing transaxle concerns.
Use the Diagnostic Flow Chart as a guide and follow the steps as indicated.
Preliminary Inspection
- Know and understand the customer's concern.
- Verify the concern by operating the vehicle.
- Check the fluid levels and condition.
- Check for non-factory-installed items and verify correct installation.
- Check shift linkages for correct adjustment.
- Check TSB messages regarding the concern.
- Carry out quick tests, both KOER and KOEO.
- Record all codes.
Diagnostics
- Carry out on-board diagnostic procedures key on/engine off (KOEO) and key on/engine running (KOER).
- Record all diagnostic trouble codes (DTCs).
- Repair all non-transaxle codes first.
- Repair all transaxle codes second.
- Erase all continuous codes and attempt to repeat them.
- Repair all continuous codes.
- If only pass codes are obtained, proceed to the «DIAGNOSIS BY SYMPTOM»(ref-233010-S40556545652006052400000) for further information and diagnosis.
Follow the diagnostic sequence to diagnose and repair the concern the first time.
Diagnostic Flow Chart
| Diagnostic Flow Chart | ||
|---|---|---|
| 1) Were any Diagnostic Trouble Codes recorded? | Yes | Repair all hard Diagnostic Trouble Codes. Follow the pinpoint tests. Refer to the INTRODUCTION - GASOLINE article first, then GO to Step 2. |
| No | Refer to DIAGNOSIS BY SYMPTOM , then GO to Step 5. | |
| 2) Are any continuous test memory codes present? | Yes | Clear codes and carry out the Drive Cycle Test, then GO to Step 3. |
| No | GO to Step 4. | |
| 3) Did the continuous test memory codes reappear? | Yes | Repair all continuous test memory codes. Follow the pinpoint tests. Refer to the INTRODUCTION - GASOLINE article then GO to Step 4. |
| No | GO to Step 4. | |
| 4) Is the concern repaired? | Yes | Carry out the final quick test to verify that no DTCs are present. Clear memory codes. |
| No | Refer to DIAGNOSIS BY SYMPTOM , then GO to Step 5. | |
| 5) Are there any electrical concerns? | Yes | Carry out the final quick test to verify that no diagnostic trouble codes are present. Clear memory codes. |
| No | Get assistance from the Technical Hotline. | |
DIAGNOSTIC FLOW CHART
Road Testing Vehicle
Note. Always drive the vehicle in a safe manner according to driving conditions and obey all traffic laws.
The Shift Point Road Test and Torque Converter Operation Tests provide diagnostic information on shift controls and torque converter operation.
Visual Inspection
This inspection will identify modifications or additions to the vehicle operating system that may affect diagnosis. Inspect the vehicle for non-Ford factory add-on devices such as
- Electronic add-on items: Air conditioning Generator (alternator) Engine turbo Cellular telephone Cruise control CB radio Linear amplifiers Backup alarm signal Computer
- Vehicle modification: These items, if not installed correctly, will affect the powertrain control module (PCM) or transmission function. Pay particular attention to add-on wiring splices in the PCM harness or transmission wiring harness, abnormal tire size or axle ratio changes. Leaks. Refer to «LEAKAGE INSPECTION»(ref-233010-S02415133342006052400000) . Correct linkage adjustments. Refer to «AUTOMATIC TRANSAXLE/TRANSMISSION EXTERNAL CONTROLS»(ref-233016) .
Carry Out On-Board Diagnostics (KOEO, KOER)
After a road test, with the vehicle warm and before disconnecting any connectors, carry out the Quick Test using the diagnostic tool. Refer to the INTRODUCTION - GASOLINE article for diagnosis and testing of the powertrain control system.
Self Diagnosis Function
The transmission control module (TCM) monitors the communication status of each sensor, electronic component and the powertrain control module (PCM). If any malfunction should occur, the TCM function warns the driver and stores the malfunction as a diagnosis code.
Fail-Safe
With the fail-safe function, if any malfunction should occur in the automatic transmission system, the TCM will output a control signal, and control will be carried out to make traveling a minimum distance possible. If all shift solenoids malfunction, the TCM will cancel the output of control signals to the solenoids. If this happens, the automatic transmission gear shifting will be controlled by fluid pressure circuits only and the gears will shift as shown in the following table.
| Range Selector Lever Position | Gear Position |
|---|---|
| R | Reverse |
| D | 3rd or 5th gear |
RANGE SELECTOR LEVER POSITION AND GEAR POSITION
On-Board Diagnostic With Diagnostic Tool
Note. For detailed instruction and other diagnostic methods using the diagnostic tool or equivalent, refer to the diagnostic tool tester manual and the INTRODUCTION - GASOLINE article .
These Quick Tests should be used to diagnose the powertrain control module (PCM) and should be carried out in order.
- Quick Test 1.0 - Visual Inspection
- Quick Test 2.0 - Set Up
- Quick Test 3.0 - Key On, Engine Off (KOEO)
- Quick Test 4.0 - Continuous Memory Codes
- Quick Test 5.0 - Key On, Engine Running (KOER)
- Special Test Modes Wiggle Test Mode Output Test Mode
- PCM Reset Mode
- Clearing DTCs P1000
- OBD II Drive Cycle
- Other diagnostic tool features
Transaxle Drive Cycle Test
| CAUTION | Prior to carrying out the transaxle drive cycle test, make sure that the transaxle is full of fluid. |
Note. Always drive the vehicle in a safe manner according to driving conditions and obey all traffic laws.
After carrying out the Quick Test, use the following Transaxle Drive Cycle Test for checking continuous codes
Note. The Transaxle Drive Cycle Test must be followed exactly. Malfunctions must occur multiple times consecutively for shift error or torque converter clutch (TCC) code to set.
Note. When carrying out the Transaxle Drive Cycle Test, see the SOLENOID OPERATION CHART for correct solenoid operation. Refer to PINPOINT TESTS - NON OSC EQUIPPED VEHICLE .
- Record and then erase Quick Test codes.
- Warm engine to normal operating temperature.
- Make sure transmission fluid level is correct.
- With transaxle in DRIVE, moderately accelerate from stop to 80 km/h (50 mph). This allows the transaxle to shift into 6th gear. Hold speed and throttle steady for minimum of 15 seconds. Brake to a stop and remain stopped for minimum of 20 seconds.
- Repeat Step 4 at least 5 times.
- Carry out Quick Test and record continuous codes. If DTCs are present, refer to «DIAGNOSTIC TROUBLE CODE (DTC) CHARTS»(ref-233010-S15783298072006052400000) . Service all non-transaxle DTCs first as they can directly affect the operation of the transaxle. Repeat the Quick Test and Road Test to verify the correction. Erase DTCs, carry out the drive cycle test, and repeat the Quick Test after completing service on the DTCs. If the continuous test passes (system pass) and a concern is still present, refer to «DIAGNOSIS BY SYMPTOM»(ref-233010-S40556545652006052400000) and check TSBs for diagnostic concern.
After On-Board Diagnostics
Note. The vehicle wiring harness, powertrain control module and non-transaxle sensors may affect transaxle operations. Service these concerns first.
After the On-Board Diagnostic procedures are completed, service all DTCs.
Begin with non-transaxle related DTCs, then service any transaxle related DTCs. Refer to the DIAGNOSTIC TROUBLE CODE (DTC) CHARTS for information on Condition and Symptoms. This chart will be helpful in referring to the correct manual(s) and to aid in diagnosing internal transaxle concerns and external non-transaxle inputs. The pinpoint tests are used in diagnosing electrical concerns of the transaxle. Make sure that the vehicle wiring harness and the powertrain control module (PCM) are diagnosed as well. Refer to the INTRODUCTION - GASOLINE article for diagnosing non-transaxle electronic components. The diagnostic routine hydraulic/mechanical charts will help in diagnosing internal transaxle concerns and external non-transaxle inputs.
Diagnostic Trouble Code Chart
| Five Digit DTC | Component | Description | Condition | Symptom | Action |
|---|---|---|---|---|---|
| P0562 | Battery | System voltage low | PCM detected a voltage level below 9 volts | No engagements, no adaptive or self-learning strategy. | REFER to the INTRODUCTION - GASOLINE article . |
| P0563 | Battery | System voltage high | PCM detected a voltage level above 18 volts | No adaptive or self-learning strategy. | REFER to the INTRODUCTION - GASOLINE article . |
| P0601 | PCM | PCM ROM error | PCM detected an internal software concern with ROM | No engagements, no adaptive or self-learning strategy. | REFER to the INTRODUCTION - GASOLINE article . |
| P0603 | PCM | PCM KAM error | PCM detected an internal software concern with KAM | No engagements, no adaptive or self-learning strategy. | REFER to the INTRODUCTION - GASOLINE article . |
| P0604 | PCM | PCM RAM error | PCM detected an internal software concern with RAM | No engagements, no adaptive or self-learning strategy. | REFER to the INTRODUCTION - GASOLINE article . |
| P0706 | TR sensor | TR sensor range or performance error | TR sensor signal is out of normal range | TR sensor indicates a stuck position (D-3rd gear), no adaptive or self learning strategy. | Install a new TCM. |
| P0707 | TR sensor | TR sensor circuit low input | TR sensor signal is below threshold of 0.127 volts, sensor/circuit electrical malfunction | TR sensor indicates a stuck position (D-3rd gear), no adaptive or self learning strategy. | Install a new TCM. |
| P0708 | TR sensor | TR sensor circuit high input | TR sensor signal is above threshold of 4.87 volts, sensor/circuit electrical malfunction | TR sensor indicates a stuck position (D-3rd gear), no adaptive or self learning strategy. | Install a new TCM. |
| P0711 | TFT sensor | No change in TFT during operation | PCM has detected no TFT change during operation. TFT value stuck at some normal reading | TFT indicates 80°C (176°F) at all times, no self learning strategy, no TCC engagement. | GO to PINPOINT TEST B . |
| P0712 | TFT sensor | 200°C (329°F) indicated, TFT sensor circuit grounded | Voltage drop across TFT sensor exceeds scale set for temperature -43°C (-45°F) | TFT indicates 80°C (176°F) at all times, no self learning strategy, no TCC engagement. | GO to PINPOINT TEST B . |
| P0713 | TFT sensor | 43°C (-45°F) indicated, TFT sensor circuit grounded | Voltage drop across TFT sensor exceeds scale set for temperature -43°C (-45°F) | TFT indicates 80°C (176°F) at all times, no self learning strategy, no TCC engagement. | GO to PINPOINT TEST B . |
| P0716 | TSS sensor | TSS range out of performance, insufficient input from TSS | PCM has detected a loss or noisy TSS signal during operation | No TCC engagements, no adaptive or self learning strategy. | GO to PINPOINT TEST D . |
| P0717 | TSS sensor | No TSS signal | PCM has not detected a TSS signal. No TSS signal when OSS signal present | No TCC engagements, no adaptive or self learning strategy. | GO to PINPOINT TEST D . |
| P0721 | OSS sensor | OSS range out of performance, insufficient input from OSS | PCM has detected a loss or noisy OSS signal during operation | No adaptive or self learning strategy. | GO to PINPOINT TEST C . |
| P0722 | OSS sensor | No OSS signal | PCM has detected no TSS signal | No engagements, no adaptive or self learning strategy. | GO to PINPOINT TEST C . |
| P0729 | Transaxle | 6th gear ratio | No 6th gear ratio detected by TCM | No 6th gear, no TCC engagements, no adaptive or self learning strategy. | GO to PINPOINT TEST A . |
| P0730 | Clutch control solenoids or internal parts | Gear ratio error | PCM has detected a gear ratio error | No self learning strategy. | GO to PINPOINT TEST A . |
| P0731 | Solenoid or internal parts | 1st gear ratio | No 1st gear ratio detected by TCM | No 1st gear, no TCC engagements, no adaptive or self learning strategy. | GO to PINPOINT TEST A . |
| P0732 | Solenoid or internal parts | 2nd gear ratio | No 2nd gear ratio detected by TCM | No 2nd gear, no TCC engagements, no adaptive or self learning strategy. | GO to PINPOINT TEST A . |
| P0733 | Solenoid or internal parts | 3rd gear ratio | No 3rd gear ratio detected by TCM | No 3rd gear, no TCC engagements, no adaptive or self learning strategy. | GO to PINPOINT TEST A . |
| P0734 | Solenoid or internal parts | 4th gear ratio | No 4th gear ratio detected by TCM | No 4th gear, no TCC engagements, no adaptive or self learning strategy. | GO to PINPOINT TEST A . |
| P0735 | Solenoid or internal parts | 5th gear ratio | No 5th gear ratio detected by TCM | No 5th gear, no TCC engagements, no adaptive or self learning strategy. | GO to PINPOINT TEST A . |
| P0736 | Transaxle | Reverse gear ratio | No reverse gear ratio detected by TCM | No reverse gear, no self learning strategy. | GO to PINPOINT TEST A . |
| P0780 | Solenoid or valve internal to transaxle | Universal shifting (stuck valve) | Valve stuck | Increase rpm during shifts. Slipping or erratic shifting. | Go to MAIN CONTROL VALVE BODY . |
| P0817 | Starter circuit | Starter circuit error | TCM detected a failure in the starter circuit, failed ON or OFF | No TCC engagements, no adaptive or self learning strategy. | Go to STARTING SYSTEM . |
| P0961 | PCA | PCA circuit or solenoid failure | PCA circuit or solenoid (SLT) failed during operation. Incorrect commanded current detected by TCM | No engagements, no adaptive or self learning strategy. | GO to PINPOINT TEST A . |
| P0962 | PCA | PCA solenoid signal or grounded circuits either short or open, solenoid circuit failure | Voltage through PCA solenoid (SLT) is checked. An error will be noted if tolerance is exceeded | No engagements, no adaptive or self learning strategy. | GO to PINPOINT TEST A . |
| P0963 | PCA | PCA solenoid short to power circuit failure | Voltage through PCA solenoid (SLT) is checked. An error will be noted if tolerance is exceeded | No engagements, no adaptive or self learning strategy. | GO to PINPOINT TEST A . |
| P0973 | SSA | SSA solenoid or circuit shorted to ground | Voltage through SSA solenoid (SI) circuit is checked. An error will be noted if tolerance is exceeded. Short to ground failure detected | No engagements, no adaptive or self learning strategy. | GO to PINPOINT TEST A . |
| P0974 | SSA | SSA solenoid or circuit shorted to power or open | Voltage through SSA solenoid (SI) circuit is checked. An error will be noted if tolerance is exceeded. Short to power failure or open circuit detected | No engagements, no adaptive or self learning strategy. | GO to PINPOINT TEST A . |
| P0976 | SSB | SSB solenoid or circuit shorted to ground | Voltage through SSB solenoid (S2) circuit is checked. An error will be noted if tolerance is exceeded. Short to ground failure detected | No engagements, no adaptive or self learning strategy. | GO to PINPOINT TEST A . |
| P0977 | SSB | SSB solenoid or circuit shorted to power or open | Voltage through SSB solenoid (S2) circuit is checked. An error will be noted if tolerance is exceeded. Short to power failure or open circuit detected | No engagements, no adaptive or self learning strategy. | GO to PINPOINT TEST A . |
| P0978 | SSC | SSC circuit or solenoid failure | SSC circuit or solenoid (SLC1) failed during operation. Incorrect commanded current detected by TCM | No engagements, no adaptive or self learning strategy. | GO to PINPOINT TEST A . |
| P0979 | SSC | SSC solenoid signal or grounded circuits either shorted or open, solenoid circuit failure | Voltage through SSC solenoid (SLC1) circuit is checked. An error will be noted if tolerance is exceeded. Short to power failure or open circuit detected | No engagements, no adaptive or self learning strategy. | GO to PINPOINT TEST A . |
| P0980 | SSC | SSC solenoid or circuit shorted to power | Voltage through SSC solenoid (SLC1) circuit is checked. An error will be noted if tolerance is exceeded. Short to power failure or open circuit detected | No engagements, no adaptive or self learning strategy. | GO to PINPOINT TEST A . |
| P0981 | SSD | SSD circuit or solenoid failure | SSD circuit or solenoid (SLC2) failed during operation. Incorrect commanded current detected by TCM | No engagements, no adaptive or self learning strategy. | GO to PINPOINT TEST A . |
| P0982 | SSD | SSD solenoid signal or grounded circuits either shorted or open, solenoid circuit failure | Voltage through SSD solenoid (SLC2) circuit is checked. An error will be noted if tolerance is exceeded. Short to power failure or open circuit detected | No engagements, no adaptive or self learning strategy. | GO to PINPOINT TEST A . |
| P0983 | SSD | SSD solenoid or circuit shorted to power | Voltage through SSD solenoid (SLC2) circuit is checked. An error will be noted if tolerance is exceeded. Short to power failure or open circuit detected | No engagements, no adaptive or self learning strategy. | GO to PINPOINT TEST A . |
| P0984 | SSE | SSE circuit or solenoid failure | SSE circuit or solenoid (SLC3) failed during operation. Incorrect commanded current detected by TCM | No engagements, no adaptive or self learning strategy. | GO to PINPOINT TEST A . |
| P0985 | SSE | SSE solenoid signal or grounded circuits either shorted or open, solenoid circuit failure | Voltage through SSE solenoid (SLC3) circuit is checked. An error will be noted if tolerance is exceeded. Short to power failure or open circuit detected | No engagements, no adaptive or self learning strategy. | GO to PINPOINT TEST A . |
| P0986 | SSE | SSE solenoid or circuit shorted to power | Voltage through SSE solenoid (SLC3) circuit is checked. An error will be noted if tolerance is exceeded. Short to power failure or open circuit detected | No engagements, no adaptive or self learning strategy. | GO to PINPOINT TEST A . |
| P0997 | SSF | SSF circuit or solenoid failure | SSF circuit or solenoid (SLB1) failed during operation. Incorrect commanded current detected by TCM | No engagements, no adaptive or self learning strategy. | GO to PINPOINT TEST A . |
| P0998 | SSF | SSF solenoid signal or grounded circuits either shorted or open, solenoid circuit failure | Voltage through SSF solenoid (SLB1) circuit is checked. An error will be noted if tolerance is exceeded. Short to power failure or open circuit detected | No engagements, no adaptive or self learning strategy. | GO to PINPOINT TEST A . |
| P0999 | SSF | SSF solenoid or circuit shorted to power | Voltage through SSF solenoid (SLB1) circuit is checked. An error will be noted if tolerance is exceeded. Short to power failure or open circuit detected | No engagements, no adaptive or self learning strategy. | GO to PINPOINT TEST A . |
| P1573 | APP sensor | APP sensor input error | PCM has detected an input error from the APP sensor | No adaptive or self learning strategy. | REFER to the INTRODUCTION - GASOLINE article . |
| P1657 | TCM | TCM communication link error | CAN link error detected by PCM | No engagements, no adaptive or self learning strategy. Limited fuel and spark. | Install a new transmission control module (TCM). |
| P1700 | Transaxle | Drive engagement error | TCM detected neutral in the DRIVE position | No engagements, no adaptive or self learning strategy. | REFER to DIAGNOSIS BY SYMPTOM . |
| P1701 | Transaxle | Reverse engagement error | TCM detected neutral in the REVERSE position | No self learning strategy. | REFER to DIAGNOSIS BY SYMPTOM . |
| P1919 | ECT | ECT sensor signal error | PCM/TCM have detected an error in the CAN ECT information | No TCC engagements, ECT set to 80°C (176°F). | REFER to the INTRODUCTION - GASOLINE article . |
| P1920 | Engine RPM | Engine RPM sensor signal error | PCM/TCM have detected an error in the CAN engine RPM information | No adaptive or self learning strategy. Limited fuel and spark. | REFER to the INTRODUCTION - GASOLINE article . |
| P2544 | PCM | Torque management request input signal A | Data received from the PCM or engine components are not correct for the vehicle operating conditions. Incorrect engine torque calculation may result | Transmission may enable limp-home strategies or increase pressures. Engine components and PCM may or may not set additional DTCs. P2544, fuel monitor error, ECT sensor failure and MAF sensor failures may be present. MIL may illuminate. | REFER to the INTRODUCTION - GASOLINE article . |
| P2757 | TCC solenoid | TCC solenoid circuit failure, stuck OFF | TCC solenoid (SLU) circuit fails to provide voltage drop across solenoid. Circuit open, shorted or PCM driver failure during on-board diagnostic | No TCC engagements, no adaptive or self learning strategy. | GO to PINPOINT TEST A . |
| P2758 | TCC solenoid | TCC solenoid circuit failure, stuck ON | TCC solenoid (SLU) circuit fails to provide voltage drop across solenoid. Circuit open, shorted or PCM driver failure during on-board diagnostics | No TCC engagements, no adaptive or self learning strategy. | GO to PINPOINT TEST A . |
| P2762 | TCC solenoid | TCC circuit or solenoid failure | TCC circuit or solenoid (SLU) failed during operation. Incorrect commanded current detected by TCM | No engagements, no adaptive or self learning strategy. | GO to PINPOINT TEST A . |
| P2763 | TCC solenoid | TCC circuit shorted to power | TCC solenoid (SLU) circuit fails to provide voltage drop across solenoid. Circuit shorted to power | No TCC engagements, no adaptive or self learning strategy. | GO to PINPOINT TEST A . |
| P2764 | TCC solenoid | TCC solenoid signal or grounded circuits either short or open solenoid circuit failure | TCC solenoid (SLU) circuit fails to provide voltage drop across solenoid | No TCC engagements, no adaptive or self learning strategy. | GO to PINPOINT TEST A . |
| U0073 | TCM CAN | TCM communication link error | CAN link error detected by PCM | No engagements, no adaptive or self learning strategy. | REFER to the INTRODUCTION - GASOLINE article . |
| U0100 | TCM CAN | TCM communication link error | CAN link error detected by PCM | No engagements, no adaptive or self learning strategy. | REFER to the INTRODUCTION - GASOLINE article . |
| U0121 | ABS system | TCM communication link error | PCM/TCM have detected an error in the CAN wheel RPM information from the ABS system | No engagements, no adaptive or self learning strategy. | REFER to the INTRODUCTION - GASOLINE article . |
| U0401 | PCM/TCM | Invalid data received from the PCM or engine components | Data received from the PCM or engine components is not correct for the vehicle operating conditions | Transmission may enable limp-home strategies or increase pressures. Engine components and PCM may or may not set additional DTCs. P2544, fuel monitor error, ECT sensor failure and MAF sensor failures may be present. MIL may illuminate. | REFER to the INTRODUCTION - GASOLINE article . |
| U0415 | Wheel speed sensor | TCM communication link error | PCM/TCM have detected an error in the CAN wheel RPM information from the ABS system | No adaptive or self learning strategy. | REFER to the INTRODUCTION - GASOLINE article . |
DIAGNOSTIC TROUBLE CODE CHART
Scheme 5
Scheme 6
Scheme 7
Note. For testing, place the positive lead on the terminal with the + sign and place the negative lead on the terminal with the - sign.
| Pin Number | Pin Acronym | Description | Input/ Output to TCU | Measure pins | Condition For Testing | Reference Value |
|---|---|---|---|---|---|---|
| Al | B+ | Battery voltage | +A1 to -ground | Hot at all times | 10--14 volts | |
| A5 | STLK | Start lock signal output | Output | +A5 to -A9 | Ignition on in PARK Ignition on in other than PARK | 0--0.8 volts 9--14 volts |
| A6 | CANL | CAN communication low | Input/output | +A6 to -A9 | Engine idling | |
| A7 | LIN | LIN line communication signal | Input | +A7 to -A9 | ||
| A8 | CANH | CAN communication high | Input/output | +A8 to -A9 | Engine idling | |
| A9 | GRND | TCU ground | +ground to -chassis ground | |||
| All | IG | Ignition switch signal input | Input | +A11 to -A9 | Ignition ON | 10--14 volts |
| A14 | K | Diagnostic signal | Input/output | +A14 to -A9 | ||
| B1 | PCA ground | PCA ground (SLTG) | ||||
| B2 | SSB | Shift solenoid B (S2) | Output | +B2 to -ground | Vehicle in PARK, engine idling | 0--1.5 volts |
| B3 | PCA | Pressure control solenoid A | Output | +B3 to -B1 | Vehicle in PARK, engine idling | |
| B4 | TCC ground | Torque converter clutch solenoid ground (SLUG) | ||||
| B5 | SSA | Shift solenoid A (SI) | Output | +B5 to -ground | Vehicle in PARK, engine idling | 0--1.5 volts |
| B7 | TFT ground | Transmission fluid temperature sensor ground (OTG) | ||||
| B8 | TFT | Transmission fluid temperature sensor (OT) | Input | +B8 to -B7 | TFT at 10°C to 110°C (50°F to 230°F) | 4.0 to 0.0 volts |
| B9 | TCC | Torque converter clutch solenoid (SLU) | Output | +B9 to -B4 | Vehicle in PARK, engine idling | |
| B10 | SSC ground | Shift solenoid C ground (SLC1G) | ||||
| B11 | SSC | Shift solenoid C (SLC1) | Output | +B11 to -BIO | Vehicle in PARK, engine idling | |
| B12 | ISS | Input shaft speed sensor signal (NIN) | Input | +B12 to -B13 | Vehicle in PARK, engine idling | |
| B13 | ISS ground | Input shaft speed sensor signal (NIN) | ||||
| B14 | SSE | Shift solenoid E | Output | +B14 to -B22 | Vehicle in PARK, engine idling | |
| B16 | SSF ground | Shift solenoid F ground (SLB1G) | ||||
| B17 | SSD | Shift solenoid D (SLC2) | Output | +B17 to -B18 | Vehicle in PARK, engine idling | |
| B18 | SSD ground | Shift solenoid D ground (SLC2G) | ||||
| B19 | OSS | Output shaft speed sensor signal (SP+) | Input | +B19 to -B20 | Vehicle speed approximately 20 km/h (12 mph) | |
| B20 | OSS ground | Output shaft speed sensor ground (SP-) | ||||
| B21 | SSF | Shift solenoid F (SLB1G) | Output | +B21 to -B16 | Vehicle in PARK, engine idling | |
| B22 | SSE ground | Shift solenoid E ground (SLC3G) |
PIN NUMBER DESCRIPTION CHART
PINPOINT TEST A: SHIFT SOLENOIDS
Note. Refer to the Transaxle Vehicle Harness Connector illustration preceding these pinpoint tests.
Scheme 8
Scheme 9
Scheme 10
Scheme 11
Scheme 12
Scheme 13
Scheme 14
Scheme 15
Scheme 16
Scheme 17
- A1 ELECTRONIC DIAGNOSTICS Check to make sure the transmission harness connector is fully seated, pins are fully engaged in the connector and in good condition before proceeding. Key in OFF position. Connect the scan tool. Key in ON position. Enter the following diagnostic mode on the scan tool: Retrieve DTC Codes. Are their any transmission DTCs fault present? Yes : For shift solenoids SSA and SSB, GO to A2. For shift solenoids PCA, SSC, SSD, SSE, SSF and TCC, GO to A4 . No : CLEAR all DTCs. ROAD TEST to verify if concern is still present. Concern could be intermittent. If concern is still present or reappears go to the appropriate pinpoint test steps: For shift solenoids SSA and SSB, GO to. For shift solenoids PCA, SSC, SSD, SSE, SSF and TCC, GO to A4.
- A2 CHECK RESISTANCE OF THE ON/OFF SOLENOID CIRCUIT Key in OFF position. Remove the transmission control module (TCM). Measure the resistance at the transaxle bulkhead electrical connector between pin 2 and ground for SSB. Measure the resistance at the transaxle bulkhead electrical connector between pin 5 and ground for SSA. Is the resistance between 11-15 ohms? Yes : Install a new transmission control module (TCM) and re-flash to the latest level calibration. CLEAR all DTCs. ROAD TEST to verify concern is not present. Concern could be intermittent. If concern is still present or reappears, GO to A3. No : GO to A3.
- A3 CHECK RESISTANCE OF THE ON/OFF SOLENOIDS Remove the transaxle side cover. Remove the wiring connector from the effected solenoid (SSA or SSB). Measure the resistance between solenoid pin 1 and ground of the affected solenoid. Is each solenoid resistance between 11-15 ohms? Yes : INSTALL a new internal wire harness or repair effected circuit. No : INSTALL a new main control.
- A4 CHECK LINEAR SOLENOID SHORT TO GROUND Key in OFF position. Remove the transmission control module (TCM). Measure the resistance at transaxle bulkhead electrical connector between pins 1, 3, 4, 9, 10, 11, 14, 16, 17, 18, 21, 22 and ground. Is each resistance greater than 10,000 ohms? Yes : GO to A5. No : GO to A6 .
- A5 CHECK RESISTANCE OF THE LINEAR SOLENOID(S) Inspect both sides of the transmission control module for damaged or pushed out pins, corrosion or damaged seals. For the TCC solenoid, measure the resistance between pin 4 and pin 9 at the transaxle. For the PCA solenoid, measure the resistance between pin 3 and pin 1 at the transaxle. For the SSF solenoid, measure the resistance between pin 21 and pin 16 at the transaxle. For the SSC solenoid, measure the resistance between pin 11 and pin 10 at the transaxle. For the SSD solenoid, measure the resistance between pin 17 and pin 18 at the transaxle. For the SSE solenoid, measure the resistance between pin 14 and pin 22 at the transaxle. Is the resistance between 5.0 - 5.6 ohms? Yes : Install a new transmission control module (TCM) and re-flash to the latest level calibration. CLEAR all DTCs. ROAD TEST to verify concern is not present. Concern could be intermittent. If concern is still present or reappears, GO to A6. No : GO to A6.
- A6 CHECK CONTINUITY OF THE INTERNAL HARNESS Remove the transaxle side cover. Remove the wiring connector from the effected solenoid(s) (PCA, SSC, SSD, SSE, SSF and TCC). Measure the resistance between the bulkhead connector and the affected solenoid electrical connector. Is each solenoid resistance less than 5 ohms? Yes : INSTALL a new main control. No : INSTALL a new internal wire harness or repair effected circuit.
Scheme 18
Scheme 19
Scheme 20
- B1 ELECTRONIC DIAGNOSTICS Connect the scan tool. Check to make sure the transmission harness connector is fully seated, pins are fully engaged in connector and in good condition before proceeding. Key in ON position. Select Diagnostic Data Link. Select TCM. Select PID/Transmission Fluid Temp (TFT). Enter the following diagnostic mode on the scan tool: PIDs; TFT. Does the vehicle enter PID/Transmission Fluid Temp (TFT)? Yes : GO to B2. No : REPEAT procedure to enter PID. If vehicle did not enter PID, REFER to the «INTRODUCTION - GASOLINE»(ref-229953) article .
- B2 TEMPERATURE SIGNAL CHECK Key in ON position. Select Diagnostic Data Link. Select TCM. Select PID/Transmission Fluid Temp. Enter the following diagnostic mode on the scan tool: PIDs; TFT. Monitor the TFT PID. The temperature value should be within -55°C to 175°C (-65°F to 347°F). Is the TFT temperature within specified range? Yes : GO to B3. No : GO to B4
- B3 WARM-UP/COOL-DOWN CYCLE While monitoring the TFT PIDs, carry out the following test: If transmission is cold, run transmission to warm it up. If transmission is warm, allow transmission to cool down. Do the TFT PIDs increase as the transmission is warmed up, decrease as the transmission is cooled and does the TFT stay within the specified range? Yes : Install a new transmission control module (TCM) and re-flash to the latest level calibration. CLEAR all DTCs. ROAD TEST to verify concern is not present. Concern could be intermittent. If concern is still present or reappears, GO to B4. No : GO to B4.
- B4 SIGNAL RESISTANCE Remove the transmission control module (TCM). Inspect both sides of the transmission control module for damaged or pushed out pins, corrosion or damaged seals. Measure the resistance between pins 7 and 8 at the transmission bulkhead electrical connector. Refer to the following table «TRANSMISSION FLUID TEMPERATURE SENSOR RESISTANCE»(ref-233010-S31911524112006052400000) . TRANSMISSION FLUID TEMPERATURE SENSOR RESISTANCE °c °F Resistance (Ohms) 10 50 6.445 25 77 3.5 110 230 0.247 Record the resistance. Is the resistance within range? Yes : GO to B5. No : INSTALL a new internal harness and TFT assembly.
- B5 SHORT TO GROUND Measure the resistance between pin 7 and ground at the transmission bulkhead electrical connector. Measure the resistance between pin 8 and ground at the transmission bulkhead electrical connector. Record the resistances. Are the resistances greater than 10,000 ohms? Yes : INSTALL a new transmission control module (TCM) and re-flash to the latest level calibration. No : INSTALL a new internal harness and TFT assembly.
Scheme 21
Scheme 22
Scheme 23
Scheme 24
- C1 ELECTRONIC DIAGNOSTICS Check to make sure the transmission control module connector is fully seated, pins are fully engaged in connector and in good condition before proceeding. Connect the scan tool. Key in ON position. Monitor the PID for the output shaft speed (OSS) sensor. Monitor and record speed. Does the OSS match the vehicle speed? Yes : CLEAR all DTCs. ROAD TEST to verify concern is not present. Concern could be intermittent. If concern is still present or reappears, GO to C2. No : GO to C2.
- C2 CHECK OSS SENSOR RESISTANCE Remove the transmission control module (TCM). Measure the resistance at the transaxle bulkhead electrical connector between pin 19 and 20. Is the resistance less than 5 ohms? Yes : CLEAR all DTCs. ROAD TEST to verify concern is not present. Concern could be intermittent. If concern is still present or reappears, GO to C3. No : GO to C4 .
- C3 CHECK OSS SENSOR FOR SHORT TO GROUND Remove the transmission control module (TCM). Measure the resistance at the transaxle bulkhead electrical connector between pin 19 and ground. Measure the resistance at the transaxle bulkhead electrical connector between pin 20 and ground. Is the resistance greater than 10,000 ohms? Yes : INSTALL a new transmission control module (TCM) and re-flash to the latest level calibration. CLEAR all DTCs. ROAD TEST to verify concern is not present. Concern could be intermittent. If concern is still present or reappears, GO to C4. No : GO to C4.
- C4 CHECK OSS SENSOR RESISTANCE Remove the transmission side cover. Measure the resistance at the speed sensor electrical connector between pin 1 and 2. Is the resistance less than 5 ohms? Yes : INSTALL a new internal harness. No : INSTALL a new transaxle assembly.
Scheme 25
Scheme 26
Scheme 27
- D1 ELECTRONIC DIAGNOSTICS Check to make sure the transmission control module connector is fully seated, pins are fully engaged in connector and in good condition before proceeding. Connect the scan tool. Key in ON position. Monitor the PID for the turbine shaft speed (TSS) sensor. Monitor and record speed. Does the TSS match the engine rpm? Yes : CLEAR all DTCs. ROAD TEST to verify concern is not present. Concern could be intermittent. If concern is still present or reappears, GO to D2. No : GO to D2.
- D2 CHECK TSS SENSOR RESISTANCE Remove the transmission control module (TCM). Measure the resistance at the transaxle bulkhead electrical connector between pin 12 and 13. Is the resistance less than 5 ohms? Yes : CLEAR all DTCs. ROAD TEST to verify concern is not present. Concern could be intermittent. If concern is still present or reappears, GO to D3. No : GO to D4 .
- D3 CHECK TSS SENSOR CIRCUIT FOR SHORT TO GROUND Remove the transmission control module. Measure the resistance at the transaxle bulkhead electrical connector between pin 12 and ground. Measure the resistance at the transaxle bulkhead electrical connector between pin 13 and ground. Is the resistance greater than 10,000 ohms? Yes : INSTALL a new transmission control module (TCM) and re-flash to the latest level calibration. CLEAR all DTCs. ROAD TEST to verify concern is not present. Concern could be intermittent. If concern is still present or reappears, GO to D4. No : GO to D4.
- D4 ELECTRONIC DIAGNOSTICS Remove the transmission side cover. Measure the resistance at the TSS speed sensor electrical connector between pin 1 and 2. Is the resistance less than 5 ohms? Yes : CLEAR all DTCs. ROAD TEST to verify concern is not present. Concern could be intermittent. If concern is still present or reappears, INSTALL a new internal harness. No : The sensor is defective, INSTALL a new TSS sensor.
Stall Speed Test
| WARNING | Apply the parking brake firmly while carrying out each stall test. |
The Stall Speed Test checks
- torque converter clutch operation and installation.
- holding ability of the forward clutch.
- reverse clutch (the low-reverse bands).
- planetary one-way clutch.
- engine driveability concerns.
Conduct this test with the engine coolant and transmission fluid at correct levels and at normal operating temperature.
Apply the parking brake firmly for each Stall Speed Test.
- Find the specified stall rpm for the vehicle, see the «STALL SPEED CHART»(ref-233010-S37128314402006052400000) . Use a grease pencil to mark the rpm on the dial of a tachometer. STALL SPEED CHART Engine Stall Speed 3.0L (4V) 2,390
- Connect a tachometer to the engine.
- In each of the following ranges R, D and L, press the accelerator pedal to the floor and hold it just long enough to let the engine get to wide open throttle. While making this test, do not hold the throttle open for more than 5 seconds at a time.
- Note the results in each range.
- After each range, move the selector lever to NEUTRAL and run the engine at 1,000 rpm for about 15 seconds to cool the torque converter before making the next test.
- Use the stall speed diagnosis chart for corrective actions.
- If stall speeds were too high, see the «STALL SPEED CHART»(ref-233010-S37128314402006052400000) . If stall speeds were too low, first check engine idle speed and tune up. If engine is OK, remove torque converter and check torque converter clutch for slippage.
Pressure Diagnostic Chart
| Test Results | Possible Source |
|---|---|
| Values of both D and R ranges are lower than the standards | Insufficient engine power T/C one-way clutch slipping |
| Only the value of D range is higher than the standards | Low line pressure. Shift control solenoid assembly (SLT) failure, primary regulator valve failure Valve body failure (SLC3 hydraulic pressure system) C1 clutch slipping One-way clutch Fl failure |
| Only the value of R range is higher than the standards | Low line pressure. Shift control solenoid assembly (SLT) failure, primary regulator valve failure Valve body failure (SLC3 hydraulic pressure system) C3 clutch failure B2 brake failure |
| Values of both D and R ranges are higher than the standards | Low line pressure. Shift control solenoid assembly (SLT) failure, primary regulator valve failure Primary regulator valve failure Oil pump failure Oil strainer clogging |
PRESSURE DIAGNOSTIC CHART
Leakage Inspection
| CAUTION | Do not try to stop the fluid leak by increasing the torque beyond specifications. This may cause damage to the case threads. |
Use the following chart to inspect and correct any external transmission fluid leaks.
Leak Check Test
Fluid soluble aniline or fluorescent dyes premixed at the rate of 2.5ml (1/2 teaspoon) of dye powder to 0.235L (1/2 pint) of transmission fluid have proven helpful in locating the source of fluid leakage. Such dyes may be used to determine whether an engine oil or transmission fluid leak is present, or if the fluid in the fluid cooler leaks into the engine cooling system. An ultraviolet light must be used to detect the fluorescent dye solution.
- With the vehicle in NEUTRAL, position it on a hoist. Refer to «JACKING & LIFTING»(ref-232992) .
- Loosen the fluid drain plug and allow the fluid to drip. Note the color of the fluid.
- Tighten the drain plug to 47 Nm (35 lb-ft).
- Using a suitable nonflammable solvent, clean off any fluid from the top and bottom of the torque converter housing, flexplate, case and rear face of the engine and oil pan. Blow dry with compressed air.
- Lower the vehicle.
- Start and run the engine until the transaxle reaches its normal operating temperature.
- Observe the back of the cylinder block and the top of the torque converter housing for evidence of fluid leakage. Run the engine at fast idle, then at engine idle, occasionally shifting to the DRIVE and REVERSE ranges.
- Observe the front of the flexplate, back of the cylinder block, inside the torque converter housing and front of the case for evidence of fluid leakage.
- Continue to run the engine until fluid leakage is evident and the probable source of leakage can be determined.
- Lower the vehicle.
- Turn the vehicle OFF.
- If any leaks are evident, repair as necessary.
Diagnosis by Symptom Chart Directions
- Using the Symptom Index, select the concern/symptom that best describes the condition.
- See the routine indicated in the diagnosis by Symptom Index.
- Always begin diagnosis of a symptom with: Preliminary inspections. Verifications of condition. Checking the fluid levels. Carry out other test procedures as directed.
- Begin with the routine indicated. Follow the reference or action required statements. Always carry out the on-board diagnostic tests as required. Never skip steps. Repair as required. These components are listed in the removal sequence and by the most probable cause. All components listed must be inspected to make sure of correct repair.
Diagnosis by Symptom Index
| Title | Routines |
|---|---|
| Other Concerns | |
| Transmission fluid level | 286 |
| Transmission fluid condition | 287 |
| Transmission control module software | 288 |
| Engagement Concerns | |
| No forward and/or no reverse | 207 |
| Harsh | 208 |
| Soft | 209 |
| Torque Converter Clutch Operation Concerns | |
| Does not apply | 240 |
| Cycling/shudder/chatters | 242 |
DIAGNOSIS BY SYMPTOM INDEX