STARTER CONTROL CIRCUIT
With ignition switch in START position, current flows to Park/Neutral Position (PNP) switch. PNP switch prevents the starter from operating if the transmission is in gear. Current flows through the starter relay coil to ground. This energizes the starter relay, allowing battery power to the starter solenoid. The starter solenoid engages, allowing current to flow through starter motor field coils.
ES300
Remove glove box and locate ECM. See COMPONENT LOCATIONS. Using DVOM, backprobe ECM 22-pin connector E7 terminal No. 7 (Gray wire). (Scheme 10) Check for voltage with ignition in START position. If voltage is 6 volts or more, ECM is okay. If voltage is less than 6 volts, check for open in wiring harness or connectors between ECM and starter relay. Repair as necessary. If wiring harness and connectors are okay, replace ECM.
Scheme 10
GS300
Remove ECM hood and cover, and locate ECM. See COMPONENT LOCATIONS. Using DVOM, backprobe ECM 28-pin connector E5 terminal No. 2 (Black wire). (Scheme 11) Check for voltage with ignition in START position. If voltage is 6 volts or more, ECM is okay. If voltage is less than 6 volts, check for open in wiring harness or connectors between ECM and starter relay. Repair as necessary. If wiring harness and connectors are okay, replace ECM.
Scheme 11
GS430
Remove ECM hood and cover, and locate ECM. See COMPONENT LOCATIONS. Using DVOM, backprobe ECM 28-pin connector E6 terminal No. 12 (Black wire). (Scheme 10) Check for voltage with ignition in START position. If voltage is 6 volts or more, ECM is okay. If voltage is less than 6 volts, check for open in wiring harness or connectors between ECM and starter relay. Repair as necessary. If wiring harness and connectors are okay, replace ECM.
LS430
Remove instrument panel under cover, and locate ECM. See COMPONENT LOCATIONS. Using DVOM, backprobe ECM 31-pin connector E3 terminal No. 12 (Blue/Orange wire). (Scheme 12) Check for voltage with ignition in START position. If voltage is 6 volts or more, ECM is okay. If voltage is less than 6 volts, check for open in wiring harness or connectors between ECM, starter and starter relay. Repair as necessary. If wiring harness and connectors are okay, replace ECM.
Scheme 12
RX300
Remove glove box and locate ECM. See COMPONENT LOCATIONS. Using DVOM, backprobe ECM 22-pin connector E5 terminal No. 7 (Black wire). (Scheme 10) Check for voltage with ignition in START position. If voltage is 6 volts or more, ECM is okay. If voltage is less than 6 volts, check for open in wiring harness or connectors between ECM and starter relay. Repair as necessary. If wiring harness and connectors are okay, replace ECM.
BRUSHES
- Using a vernier caliper, measure brush length. See «STARTER SPECIFICATIONS»(ref-91435-S31558869102001031400000) . If brush length is less than minimum specification, replace brush holder and field frame.
- Using a pull scale, note brush spring tension the instant the brush spring separates from brush. See «STARTER SPECIFICATIONS»(ref-91435-S31558869102001031400000) . If brush spring tension is less than minimum specification, replace brush springs.
ES300, GS300, IS300 & RX300
| Application | Specification | |
|---|---|---|
| Brush Length | ||
| Standard | .61" (15.5 mm) | |
| Minimum | .39" (10.0 mm) | |
| Brush Spring Tension | 3.9-5.3 Lbs. (1.8-2.4 kg) | |
| Commutator Diameter | ||
| Standard | 1.18" (30.0 mm) | |
| Minimum | 1.14" (29.0 mm) | |
| Commutator Mica Undercut (Minimum) (1) | .008" (.20 mm) | |
| Commutator Runout (Maximum) | .002" (.05 mm) | |
| (1) Depth of groove between each segment of commutator. | ||
| (1) | Depth of groove between each segment of commutator. |
STARTER SPECIFICATIONS (ES300, GS300, IS300 & RX300)
GS340 & LS430
| Application | Specification | |
|---|---|---|
| Brush Length | ||
| Standard | .59" (15.0 mm) | |
| Minimum | .35" (9.0 mm) | |
| Brush Spring Tension | 4.8-6.2 Lbs. (2.2-2.8 kg) | |
| Commutator Diameter | ||
| Standard | 1.38" (35.0 mm) | |
| Minimum | 1.34" (34.0 mm) | |
| Commutator Mica Undercut (Minimum) (1) | .008" (.20 mm) | |
| Commutator Runout (Maximum) | .002" (.05 mm) | |
| (1) Depth of groove between each segment of commutator. | ||
| (1) | Depth of groove between each segment of commutator. |
STARTER SPECIFICATIONS (GS430 & LS430)
| Application | Ft. Lbs. (N.m) |
|---|---|
| Starter Bolt | 27 (37) |
| Terminal Nut | 12-13 (17-18) |
| INCH Lbs. (N.m) | |
| Air Cleaner Case Bolt (RX300) | 44 (5.0) |
| End Cover Bolt | 22 (2.5) |
TORQUE SPECIFICATIONS (ES300, GS300, IS300 & RX300)
GS430 & LS430
| Application | Ft. Lbs. (N.m) | |
|---|---|---|
| Coolant By-Pass Pipe Bolt | 13 (18) | |
| Fuel Inlet-To-Fuel Main Tube | 22 (30) | |
| Intake Manifold Bolt/Nut | 13 (18) | |
| Rear Coolant By-Pass Joint Nut | 13 (18) | |
| Starter Bolt | ||
| GS430 | 27 (37) | |
| LS430 | 29 (39) | |
| Terminal Nut | 13 (18) | |
| Throttle Body Bolt/Nut | 13 (18) | |
| INCH Lbs. (N.m) | ||
| End Cover Bolt | 32 (3.6) | |
TORQUE SPECIFICATIONS (GS430 & LS430)
