INTRODUCTION
Pin voltage charts are supplied to reduce diagnostic time. Checking pin voltages at the ECU determines whether it's receiving and transmitting proper voltage signals. Charts may also help determine if ECU harness is shorted or opened.
Note. Perform all voltage tests with a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Voltage readings may vary slightly due to battery condition or charging rate.
ECU LOCATION
| Application | Location |
|---|---|
| Stanza | Under Center Console |
ECU LOCATIONS
STANZA ECU TERMINAL IDENTIFICATION
| Pin No. | Item | Condition | Data |
|---|---|---|---|
| (1) | Ignition Signal | Engine Running, Idle Speed | 0.3-0.6V |
| " | Ignition Signal | Engine Running, 2000 RPM | App. 1.0V |
| (3) | Ignition Check | Engine Running, Idle Speed | 9-12V |
| (4) | ECCS Relay Self-Shutoff | Engine Running, Ignition OFF 1 Second After Switching OFF | 0-1V |
| " | ECCS Relay Self-Shutoff | Ignition Switch OFF, Approx. 1 Second After Switching OFF | VBAT |
| (8) | Exhaust Gas Temp Sensor (1) | Engine Running, Idle Speed | 1.0-2.0V |
| " | Exhaust Gas Temp Sensor (1) | Engine Running, EGR System Working | 0-1.0V |
| (11) | A/C Relay | Engine Running, A/C, Blower ON | 0-1.0V |
| " | A/C Relay | Engine Running, A/C Switch OFF | VBAT |
| (12) | SCV Control Solenoid Valve | Engine Running, Idle Speed | 0-1.0V |
| " | SCV Control Solenoid Valve | Engine Running, Engine Speed At 2000 RPM | VBAT |
| (16) | Airflow Meter | Engine Running (Voltage varies with RPM) | 1.0-3.0V |
| (18) | Engine Temp. Sensor | Engine Running (Voltage varies with engine water temp) | 1.0-5.0V |
| (19) | Exhaust Gas Sens | Engine Running, Warmed-Up | 0-1.0V |
| (20) | Throttle Sensor | Ignition Switch ON, (Voltage varies with throttle valve opening angle) | 0.4-4.0V |
| (22) (30) | Crank Angle Sens Reference Signal | Engine Running (2) | 0.2-0.5V |
| (26) | Air Temperature Sensor | Ignition Switch ON, Intake Air Temperature 20°C (68°F) | Approx. 1.0-1.5V |
| " | Air Temperature Sensor | Ignition Switch ON, Intake Air Temperature 80°C (176°F) | Approx. 0.3V |
| (31) (40) | Crank Angle Sens Position Signal | Engine Running (2) | 2.0-3.0V |
| (34) | Start Signal | Cranking | 8-12V |
| (35) | Neutral Switch & Inhibitor Switch | Ignition Switch ON, Neutral | 0V |
| " | Neutral Switch & Inhibitor Switch | Ignition Switch ON, Other Gear | App. 6V |
| (36) | Ignition Switch | Ignition Switch OFF | 0V |
| " | Ignition Switch | Ignition Switch ON | VBAT |
| (37) | Throttle Sensor Power Supply | Ignition Switch ON | Approx. 5V |
| (38) (47) | ECU Power Supply | Ignition Switch ON | VBAT |
| (41) | A/C Switch | Engine Running A/C, Blower ON | 0V |
| " | A/C Switch | Engine Running A/C Switch OFF | VBAT |
| (43) | Power Steering Pressure Switch | Engine Running, Steering Wheel Being Turned | 0V |
| " | Power Steering Pressure Switch | Engine Running, Steering Wheel Is Not Turned | 8-9V |
| (45) | Thermo Control Amplifier | Engine Running, A/C Operating Outlet Air Temp Between 3-8°C (37-46°F) | Approx. 8-9V |
| " | Thermo Control Amplifier | Engine Running, A/C Operating Outlet Air Temp Over 8°C (46°F) | Approx. 0V |
| (46) | Back-Up Power | Ignition Switch OFF | VBAT |
| (101) (103) (110) (112) | Injector No. 1 Injector No. 3 Injector No. 2 Injector No. 4 | Engine Running | VBAT |
| (102) | AIV Control Solenoid Valve | Engine Running, Idle Speed | 0-1.0V |
| " | AIV Control Solenoid Valve | Engine Running, Accelerator Is Depressed, After Warm-Up | VBAT |
| (104) | Fuel Pump Relay | For 5 Seconds After Switching Ignition ON, Engine Running | 0.7-0.9V |
| " | Fuel Pump Relay | Within 5 Seconds After Switching Ignition ON | VBAT |
| (105) | EGR Control Solenoid Valve | Engine Running, Cold, Water Temperature Below 60°C (140°F) | 0.7-0.9V |
| " | EGR Control Solenoid Valve | Engine Running, Warm-Up Condition, Water Temperature Between 60-105°C (140-221°F) | VBAT |
| (106) | Pressure Regulator Control Solenoid Valve | Stop/Restart Engine After Up, Water Temperature Above 90°C (194°F) | 0-1.0V For 3 Min After Turn OFF |
| " | Pressure Regulator Control Solenoid Valve | Stop/Restart Engine After Up, Water Temperature Below 90°C (194°F) | VBAT |
| (113) | AAC Valve | Engine Running, Idle Speed | 7-10V |
| " | AAC Valve | Engine Running, Steering Wheel Is Being Turned, A/C ON, Rear Defogger ON, Headlights High | 4-7V |
| (1) California only. (2) Do not run engine at high speed under no-load. | |||
| (1) | California only. |
| (2) | Do not run engine at high speed under no-load. |
STANZA ECU TERMINAL IDENTIFICATION