GENERAL
Note. Overhaul information for the A4AF3 automatic transaxle is not available from the manufacturer.
MALFUNCTION INDICATOR LIGHT (MIL)
An on-board diagnostic light comes on to notify the driver that there is problems in the vehicle. However, when an irregular state returns to normal, the malfunction indicator light will go out automatically after 3 driving cycles that have no same fault. Immediately after the ignition switch is turned on, the malfunction indicator light operates normally.
THE FOLLOWING ITEMS WILL BE INDICATED BY THE MIL
- Fluid temperature sensor
- Pulse Generator A (PG-A)
- Pulse Generator B (PG-B)
- Shift Control Solenoid Valve A (SCSV-A)
- Shift Control Solenoid Valve B (SCSV-B)
- Shift Control Solenoid Valve C (SCSV-C)
- Pressure Control Solenoid Valve (PCSV-A)
- Pressure Control Solenoid Valve B (PCSV-B)
- Damper Clutch Solenoid Valve (DCSV)
- Shift Stage Synchronize
- Transaxle Range Switch
SERVICE DATA
(WHEN A HI-SCAN PRO IS USED)
| Diagnosis items | Checking procedures | Checking items (Remedy) | |
|---|---|---|---|
| Check conditions | Normal value | ||
| Throttle position sensor (TPS) | Accelerator pedal fully released | 2 ~ 18 % | TPS or circuit harness if no change occurs TPS or accelerator pedal cable if gradual change is not noted |
| Press accelerator pedal slowly | Varies with accelerator opening | ||
| Accelerator pedal pressed to floor | 80 ~ 100% | ||
| Fluid temperature sensor | Cold engine (before starting) | Equivalent to outside air temperature | Fluid temperature sensor or circuit harness |
| While warming up engine | Gradual increase | ||
| After warming up engine | 70 ~ 110°C | ||
| Kickdown servo switch | L range : Idling | ON | Kickdown servo misadjusted Kickdown servo switch or circuit harness Kickdown servo |
| D range : First or third gear | ON | ||
| D range : Second or fourth gear | OFF | ||
| Engine speed | P range : Idling Accelerator pedal : Fully closed | 600 ~ 800 rpm | Ignition system Ignition signal pick-up circuit harness |
| P range : Idling Accelerator pedal : depressed | |||
| Air conditioning relay signals | P range : Idle, air conditioning ON | ON | Air conditioning power relay circuit harness |
| P range : Idle, air conditioning OFF | OFF | ||
| Shift position | 1st speed : 10km/h | First | PCM Transaxle range switch system TPS system |
| 2nd speed : 30km/h | Second | ||
| 3rd speed : 50km/h | Third | ||
| 4th speed : 80km/h | Fourth | ||
| Pulse generator A | D range (OD OFF) : driving at 50 km/h (31 mph) in third gear | 1,500 ~ 2,000 rpm | Pulse generator A or circuit harness Pulse generator A shielded wire Incoming noise from outside |
| D range (OD ON) : driving at 80 km/h (50 mph) in fourth gear | 1,700 ~ 2,000 rpm | ||
| Pulse generator B | D range (OD OFF) : driving at 50 km/h (31 mph) in third gear | 1,500 ~ 2,000 rpm | Pulse generator B or circuit harness Pulse generator B shielded wire Incoming noise from outside |
| D range (OD ON) : driving at 80 km/h (50 mph) in fourth gear | 1,500 ~ 2,000 rpm | ||
Service Data Checking Procedures Table (1 Of 3)
| Diagnosis items | Checking procedures | Checking items (Remedy) | |
|---|---|---|---|
| Check conditions | Normal value | ||
| Overdrive switch | Ignition switch : ON Engine : stopped Overdrive switch is turned ON | OD-ON | Overdrive switch or circuit harness |
| Ignition switch : ON Engine : stopped Overdrive switch is turned OFF | OD-OFF | ||
| Transaxle range switch | Shift selector lever to P range | P | Transaxle range switch misadjusted Transaxle range switch or circuit harness Manual control cable If selector lever is inoperative, check shift lock mechanism |
| Shift selector lever to R range | R | ||
| Shift selector lever to N range | N | ||
| Shift selector lever to D range | D | ||
| Shift selector lever to 2 range | 2 | ||
| Shift selector lever to L range | L | ||
| Vehicle speed sensor | Keep vehicle stopped | 0 km/h | Vehicle speed sensor if high speed signal is delivered while vehicle is stopping In other cases, vehicle speed sensor or circuit harness |
| Driving at 40 km/h (25 mph) in 2 range | 40km/h (25 mph) | ||
| Driving at 50 km/h (31 mph) in D range, OD OFF | 50km/h (31 mph) | ||
| PCSV-A duty | D range : Idling | 75 ~ 90% | When accelerator pedal is slightly pressed while idling in D range, duty should become 100% PCM TPS system |
| D range : first gear | 100% | ||
| PCSV-B duty | D range : Idling | 0% | PCM TPS system |
| D range : first gear | 0% | ||
Service Data Checking Procedures Table (2 Of 3)
| Diagnosis items | Checking procedures | Checking items (Remedy) | |
|---|---|---|---|
| Check conditions | Normal value | ||
| Torque converter slip amount | D range : third gear, 70km/h, OD OFF | 0~50 rpm | Torque converter Ignition signal wire or pulse generator A system Inappropriate transaxle fluid pressure Torque converter control solenoid valve |
| DCCSV duty | D range : third gear, 70km/h, OD OFF | 40 ~ 85% | PCM TPS system Pulse generator A system Torque converter control solenoid valve |
Service Data Checking Procedures Table (3 Of 3)
Scheme 181
Scheme 182
Scheme 183
Scheme 184
Scheme 185
Scheme 186
Scheme 187
Scheme 188
Scheme 189
Scheme 190
- Completely warm up the transaxle.
- Raise the front of the vehicle so that the front wheels can be rotated.
- Connect an engine tachometer and place it in a position where it's easy to see.
- Attach the special oil-pressure gauge (09452-21500) and the adapter (09452-21002) to each oil-pressure outlet port. When the reverse pressure is to be tested, the 3000 kPa (400 psi) type of gauge should be used.
- Measure the oil pressure under various conditions, check to be sure that the measured results are within the standard value range shown in the "Standard Oil Pressure table" below. If the oil pressure is not within the specified range, check and repair as described in the section "Preliminary Steps if Oil Pressure Is Not Normal" on the next page.
Scheme 191
Scheme 192
PRESSURE CONTROL VALVE A, B
Pressure control valve A, B regulate the pressure supplied to each clutch under the control of the pressure control solenoid valve A, B to eliminate shock at the time of shifting.
(1) pressure control valve A - Not operated
Scheme 193
(1) Pressure control valve A - Operation
Scheme 194
(2) Pressure control valve B - Not Operated
Scheme 195
(2) Pressure control valve B - Operation
Scheme 196
The main function of this valve controls the rear clutch independently.
SHIFT CONTROL VALVE & SOLENOID VALVE A, B, C
The line pressure acting upon the shift control valve is controlled by the two shift control solenoid valves (which are switch ON and OFF according to the shifting gear by the transaxle control module command), and the shift control valve is activated according to the shifting gear, thus switching the oil passages.
The relationship of the shifting gear and the ON-OFF switch of shift control solenoid valve "A", "B" and "C" are shown in the table below.
Scheme 197
Scheme 198
CHANGED POINTS
- N-D valve has been eliminated.
- PCSV-B has been added for Rear clutch pressure control independently.
- Mechanical accumulator has been adopted.
- E/C release control: PCV-A, Switching of SA, E/C: CSV
Scheme 199
- Function Switching the pressure of E/C and SA.
Scheme 200
- 2nd. Gear The 2nd. pressure is supplied to SA through CSV. SCSV-C is OFF as well as 1st. gear.
Scheme 201
- 2nd. to 3rd. gear SCSV-C maintains OFF as well as 2nd gear. The E/C pressure from shift control valve is intercepted at the E/C valve during up-shifting from 2nd to 3rd gear. SA pressure is supplied from 1-2 shift valve, but the front clutch and SR pressure is also supplied from the 2-3/4-3 shift valve, so the both SR and SA pressure will be set off.
Scheme 202
- 3rd. gear SCSV-C is changed from OFF to ON. The E/C pressure is supplied from 1-2 shift valve at the CSV after finishing the up-shifting from 2nd to 3rd gear. SA pressure is supplied from shift control valve, but the front clutch and SR pressure is also supplied from the 2-3/4-3 shift valve, so the both SR and SA pressure will be set off.
Scheme 203
Scheme 204
Scheme 205
- Operating elements
- Controls R/C engaging duty control E/C releasing duty control. Continuous switching to SA
- Description R/C engaging duty control E/C releasing duty control 4th. to 2nd. Skip shift only (SCSV-C ON) When releasing the E/C clutch pressure, it is controlled by duty of PCSV-A only in case of 4th. to 2nd. skip shift. Continuous switching to SA From (SCV) to SA through (CSV)
Scheme 206
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Scheme 209
- TCM fail when drive with 1st or 2nd speed. Cutting off the E/C pressure by E/C valve F/C, SR : from 2-3/4-3 shift valve R/C : from PCV-B SA : from 1-2 shift valve
- TCM fail when drive with 1st or 2nd speed. If the hydraulic pressure is supplied to E/C and the F/C, SR pressure is delayed? R/C, E/C, SA: Interlock