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Galaxy 2000.75 (04.2000-02.2006)

Automatic Transmission/Transaxle - Vehicles With: AG4 - Diagnosis By Symptom Galaxy 2000.75 (04/2000-02/2006)
Diagnosis and Testing

General Equipment
Worldwide Diagnostic System (WDS)

How to use the symptom chart

The symptom chart for the 4-speed automatic transmission is based on a code system. The advantage of the system lies in the use of a fault code and a chart which lists every possible fault code and concern. If the transmission is renewed the fault code must be given in the report.

  1. Make sure that the preliminary inspections (diagnosis with WDS, fluid level check
    REFER to: Fluid Level Check (307-01A Automatic Transmission/Transaxle - Vehicles With: AG4, In-vehicle Repair).
    , fluid condition check
    REFER to: Preliminary Inspection (307-01B Automatic Transmission/Transaxle - Vehicles With: AG5, Diagnosis and Testing).
    and gearshift adjustment) are made.
  1. Identify the customers concern.
  1. Compare the concern with the details given in the symptom chart and identify the fault code.
  1. Using the symptom chart, find the concern in the symptom column and proceed with the appropriate routines.

Symptom Chart

Symptom Code no.
No forward gear 1
No reverse gear 2
Automatic transmission does not change ratio 3
Harsh engagement of one ratio 4
Uncontrolled or harsh shift 5
Selector lever position "1": transmission does not engage in 1st gear, (no power transfer) 6
Selector lever position "D" (DRIVE), "3" or "2": transmission does not engage in 1st gear, (no power transfer) 7
Selector lever position "D" (DRIVE), "3" or "2": transmission does not engage in 2nd gear, (no power transfer) 8
Selector lever position "D" (DRIVE) or "3": transmission does not engage in 3rd gear, (no power transfer) 9
Selector lever position "D" (DRIVE): transmission does not engage in 4th gear, (no power transfer) 10
Parking pawl does not engage 11
Sluggish selection lever operation 12
Engine will not start, or only starts in the wrong selector lever position 13
If the ignition is on, but with no foot on the brake pedal, the selector lever can still be moved from positions "N" (NEUTRAL) and "P" (PARK) 14
Reversing lamps do not operate 15
Rough engine running when driving and/or idling 16
Engine speed drops when a gear is engaged 17
Automatic transmission switches to limited operation strategy (LOS) 18
Shift timing too early/too late 19
Vehicle does not reach maximum speed 20
Final drive noise 21
Automatic transmission or differential fluid level too low, no visible external leaks in transmission 22
Transmission oily on outside 23

Symptom Chart

Code no. Symptom Action
1 No forward gear Service 1st to 3rd gear clutch and one-way clutch. Install a new clutch(es) if required.
REFER to: Transaxle (307-01A Automatic Transmission/Transaxle - Vehicles With: AG4, Disassembly).
2 No reverse gear Service reverse gear clutch or reverse gear brake. Install a new reverse gear clutch or reverse gear brake if required.
REFER to: Transaxle (307-01A Automatic Transmission/Transaxle - Vehicles With: AG4, Disassembly).
3 Automatic transmission does not change ratio Solenoid valve in valve body assembly jammed. Install a new main control valve body.
REFER to: Main Control Valve Body (307-01A Automatic Transmission/Transaxle - Vehicles With: AG4, In-vehicle Repair).
4 Harsh engagement of one ratio
  • Check engine and transmission mountings.
  • Check which gearshift change causes harsh engagement.
  • Check selector lever adjustment and install new shift elements if required.
    REFER to: External Controls (307-05 Automatic Transmission/Transaxle External Controls, Diagnosis and Testing).
5 Uncontrolled or harsh shift
  • Check for short circuits in wires to solenoid valves, install a new wiring loom.
  • Short circuit in conductor foil, install a new conductor foil.
    REFER to: Main Control Valve Body (307-01A Automatic Transmission/Transaxle - Vehicles With: AG4, In-vehicle Repair).
  • Check if solenoid valve in main control valve body is defective, install a new main control valve body if required.
    REFER to: Main Control Valve Body (307-01A Automatic Transmission/Transaxle - Vehicles With: AG4, In-vehicle Repair).
6 Selector lever position "1": transmission does not engage in 1st gear, (no power transfer) Service 1st to 3rd gear clutch and one-way clutch. Install a new clutch(es) if required.
REFER to: Transaxle (307-01A Automatic Transmission/Transaxle - Vehicles With: AG4, Disassembly).
7 Selector lever position "D" (DRIVE), "3" or "2": transmission does not engage in 1st gear, (no power transfer) Service 1st to 3rd gear clutch and one-way clutch. Install a new clutch(es) if required.
REFER to: Transaxle (307-01A Automatic Transmission/Transaxle - Vehicles With: AG4, Disassembly).
8 Selector lever position "D" (DRIVE), "3" or "2": transmission does not engage in 2nd gear, (no power transfer) Service 2nd and 4th gear brake. Install a new gear brake if required.
REFER to: Transaxle (307-01A Automatic Transmission/Transaxle - Vehicles With: AG4, Disassembly).
9 Selector lever position "D" (DRIVE) or "3": transmission does not engage in 3rd gear, (no power transfer) Service 4th gear clutch. Install a new clutch if required.
REFER to: Transaxle (307-01A Automatic Transmission/Transaxle - Vehicles With: AG4, Disassembly).
10 Selector lever position "D" (DRIVE): transmission does not engage in 4th gear, (no power transfer) Service 4th gear clutch and 2nd and 4th gear brake. Install a new clutch or gear brake if required.
REFER to: Transaxle (307-01A Automatic Transmission/Transaxle - Vehicles With: AG4, Disassembly).
11 Parking pawl does not engage
  • Adjust, or install a new, selector lever cable. REFER to: (307-05 Automatic Transmission/Transaxle External Controls)
    Selector Lever Cable Adjustment (General Procedures),
    Selector Lever Cable (Removal and Installation).
  • Service the parking pawl, parking pawl wheel and parking pawl operating mechanism.
    REFER to: Transaxle (307-01A Automatic Transmission/Transaxle - Vehicles With: AG4, Disassembly).
12 Sluggish selection lever operation
  • Shift linkage sluggish: Check shift linkage.
    REFER to: External Controls (307-05 Automatic Transmission/Transaxle External Controls, Diagnosis and Testing).
  • Shift operation sluggish in transmission: Dismantle parking pawl and install new.
    REFER to: Transaxle (307-01A Automatic Transmission/Transaxle - Vehicles With: AG4, Disassembly).
13 Engine will not start, or only starts in the wrong selector lever position
  • Carry out diagnosis with WDS.
  • Check the automatic transmission relay for damage, install new relay if required.
  • Check the transmission range (TR) sensor for damage, install a new TR sensor if required.
    REFER to: Transmission Range (TR) Sensor (307-01A Automatic Transmission/Transaxle - Vehicles With: AG4, In-vehicle Repair).
14 If the ignition is on, but with no foot on the brake pedal, the selector lever can still be moved from positions "N" (NEUTRAL) and "P" (PARK)
  • Carry out diagnosis with WDS.
  • Install a new brake/shift interlock solenoid if required.
    REFER to: Main Control Valve Body (307-01A Automatic Transmission/Transaxle - Vehicles With: AG4, In-vehicle Repair).
  • Automatic transmission module damaged, install a new automatic transmission module if required.
15 Reversing lamps do not operate
  • Carry out diagnosis with WDS.
  • Cable disconnected or terminal connector damaged. Repair the circuit
  • Contacts in transmission range (TR) sensor burnt or corroded, TR sensor inoperative. Install a new TR sensor if required.
    REFER to: Transmission Range (TR) Sensor (307-01A Automatic Transmission/Transaxle - Vehicles With: AG4, In-vehicle Repair).
16 Rough engine running when driving and/or idling
  • Carry out diagnosis with WDS.
  • Check throttle body and air guide for leaks.
17 Engine speed drops when a gear is engaged
  • Carry out diagnosis with WDS.
  • Powertrain control module (PCM) is damaged.
    REFER to: Electronic Engine Controls (303-14A Electronic Engine Controls - 2.0L/2.3L, Diagnosis and Testing).
18 Automatic transmission switches to LOS
  • Carry out diagnosis with WDS.
  • Incorrect transmission control module (TCM) installed. Install a new TCM.
  • Conductor foil damaged; a wire to the solenoid valves is damaged. Install a new conductor foil or wire as necessary.
    REFER to: Main Control Valve Body (307-01A Automatic Transmission/Transaxle - Vehicles With: AG4, In-vehicle Repair).
  • Solenoid valve jammed in the main control valve body assembly. Install a new main control valve body if required.
    REFER to: Main Control Valve Body (307-01A Automatic Transmission/Transaxle - Vehicles With: AG4, In-vehicle Repair).
  • Transmission range (TR) sensor damaged. Install a new TR sensor if required.
    REFER to: Transmission Range (TR) Sensor (307-01A Automatic Transmission/Transaxle - Vehicles With: AG4, In-vehicle Repair).
  • Crankshaft position (CKP) sensor damaged. Install a new CKP sensor if required. REFER to WDS.
  • Turbine shaft speed (TSS) sensor damaged. REFER to WDS. Install a new TSS sensor if required.
    REFER to: Turbine Shaft Speed (TSS) Sensor (307-01A Automatic Transmission/Transaxle - Vehicles With: AG4, In-vehicle Repair).
19 Shift timing too early/too late
  • Check the hydraulic line pressure.
    REFER to: Special Testing Procedures (307-01A Automatic Transmission/Transaxle - Vehicles With: AG4, Diagnosis and Testing).
  • Check shift timing.
    REFER to: Shift Point Road Test (307-01A Automatic Transmission/Transaxle - Vehicles With: AG4, Diagnosis and Testing).
20 Vehicle does not reach maximum speed Carry out diagnosis with WDS. Check stall speed.
REFER to: Special Testing Procedures (307-01A Automatic Transmission/Transaxle - Vehicles With: AG4, Diagnosis and Testing).
21 Final drive noise
  • Noisy taper roller bearing in differential, install a new taper roller bearing.
  • Noisy output shaft, install a new output shaft.
  • Noisy drive gear in output shaft. Noisy output gear in planetary gear, install a new output gear in planetary gear.
  • Noisy differential, install a new differential.
22 Automatic transmission or differential fluid level too low, no visible external leaks in transmission
  • Check automatic transmission and differential fluid level, refill/check fluid condition as required.
    REFER to: Transmission Fluid Drain and Refill (307-01A Automatic Transmission/Transaxle - Vehicles With: AG4, In-vehicle Repair).
  • Carry out extended road test and check fluid levels again. If the fluid level has changed, transmission fluid from the automatic transmission and transmission fluid from the differential have mixed. Install a new output shaft bearing housing oil seal and output shaft bearing housing holder O-ring.
    REFER to: Transaxle (307-01A Automatic Transmission/Transaxle - Vehicles With: AG4, Assembly).
23 Transmission oily on outside
  • Check automatic transmission and differential fluid levels. Clean engine/transmission and locate any leaks. Check transmission housing cover gasket, sump gasket, the O-rings on the oil cooler banjo bolts, the radial seal on the selector shaft, the washers on the transmission output speed sensor (OSS) or turbine shaft speed (TSS) sensor.
  • Oil leaks around the torque converter area: Install a new torque converter radial oil seal.
    REFER to: Transaxle (307-01A Automatic Transmission/Transaxle - Vehicles With: AG4, Assembly).

In-vehicle Repair > < Special Testing Procedures