Engine Controls - Pin Voltage Charts: Introduction
Pin voltage charts are supplied to reduce diagnostic time. Checking pin voltages at the Electronic Control Module (ECM) determines whether it is receiving and transmitting proper voltage signals. Charts may also help determine if ECM harness is shorted or opened.
NOTE:
Unless stated otherwise in testing procedures, perform all voltage tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance. Voltage readings may vary slightly due to battery condition or charging rate.
ECM VOLTAGE SPECIFICATIONS
| Measure Between ECM Terminals (1) | Conditions | Volts | ||||
|---|---|---|---|---|---|---|
| E7-14 & E8-16 | Always | 9-14 | ||||
| E7-23 & E9-16 | Ignition On | 9-14 | ||||
| E9-1 & E9-22 | Ignition On | 5-6 | ||||
| E9-7 & E9-22 | Ign. On & Throttle Fully Open | 3.2-4.9 | ||||
| E9-7 & E9-22 | Ign. On & Throttle Closed | 0.3-0.8 | ||||
| E9-8 & E8-7 | Ignition On | 1.1-1.5 | ||||
| E9-21 & E9-22 | Engine Idling & Intake Air Temperature 68°F (20°C) | 0.5-3.4 | ||||
| E9-20 & E9-22 | Engine Idling & Coolant Temperature 176°F (80°C) | 0.2-1.0 | ||||
| E10-13 & E8-16 | Engine Cranking | 6 Or More | ||||
| E10-10 & E10-34 | Engine Idling | Pulse Gen. | ||||
| E10-9 & E10-34 | Engine Idling | Pulse Gen. | ||||
| E10-8 & E10-34 | Engine Idling | Pulse Gen. | ||||
| E10-7 & E10-34 | Engine Idling | Pulse Gen. | ||||
| E10-6 & E10-34 | Engine Idling | Pulse Gen. | ||||
| E10-5 & E10-34 | Engine Idling | Pulse Gen. | ||||
| E10-10 & E10-34 | Ignition On | 9-14 | ||||
| E10-9 & E10-34 | Ignition On | 9-14 | ||||
| E10-8 & E10-34 | Ignition On | 9-14 | ||||
| E10-7 & E10-34 | Ignition On | 9-14 | ||||
| E10-6 & E10-34 | Ignition On | 9-14 | ||||
| E10-5 & E10-34 | Ignition On | 9-14 | ||||
| E10-24 & E8-16 | Engine Idling | Pulse Gen. | ||||
| E10-16 & E8-16 | Engine Idling | Pulse Gen. | ||||
| E10-15 & E8-16 | Engine Idling | Pulse Gen. | ||||
| E10-12 & E8-16 | Engine Idling | Pulse Gen. | ||||
| E10-12 & E8-16 | Ignition On | 4.5-5.5 | ||||
| E8-14 & E9-22 | Ignition On | 4.5-5.5 | ||||
| E9-17 & E9-6 | Engine Idling | Pulse Gen. | ||||
| E9-5 & E9-6 | Engine Idling | Pulse Gen. | ||||
| E7-3 & E8-16 | Taillight Switch On | 7.5-14 | ||||
| E7-3 & E8-16 | Taillight Switch Off | 0-1.5 | ||||
| E7-2 & E8-16 | Defogger Switch On | 7.5-14.0 | ||||
| E7-2 & E8-16 | Defogger Switch Off | 0-1.5 | ||||
| E8-12 & E10-34 | Ignition On | 9-14 | ||||
| E8-6 & E10-34 | Ignition On | 9-14 | ||||
| E9-18 & E8-16 | Ignition On | 9-14 | ||||
| E9-18 & E8-16 | Engine Idling | 0-3 | ||||
| E8-2 & E10-34 | Ignition On | 9-14 | ||||
| E10-22 & E10-34 | Ignition On Disconnect ECM E10 Connector | 9-14 | ||||
| E10-23 & E10-16 | Ignition On Disconnect ECM E10 Connector | 9-14 | ||||
| E9-13 & E8-16 | Maintain 2500 RPM 2 MinutesWith Engine Warm, Then Idle | Pulse Gen. | ||||
| E9-19 & E8-16 | Maintain 2500 RPM 2 MinutesWith Engine Warm, Then Idle | Pulse Gen. | ||||
| E7-18 & E8-16 | Maintain 2500 RPM 2 MinutesWith Engine Warm, Then Idle | Pulse Gen. | ||||
| E8-10 & E10-28 | Idling | 3 Or Less | ||||
| E8-10 & E10-28 | Ignition On | 9-14 | ||||
| E8-11 & E10-28 | Idling | 3 Or Less | ||||
| E8-11 & E10-28 | Ignition On | 9-14 | ||||
| E7-17 & E10-28 | Idling | 3 Or Less | ||||
| E7-17 & E10-28 | Ignition On | 9-14 | ||||
| E9-15 & E8-16 | Idling | Pulse Gen. | ||||
| E9-14 & E8-16 | Idling | Pulse Gen. | ||||
| E10-14 & E8-16 | Ignition On & Gearshift Not In "P" Or "N" | 9-14 | ||||
| E10-14 & E8-16 | Ignition On & Gearshift In "P" Or "N" | 3 Or Less | ||||
| E7-12 & E8-16 | Ignition On & Rotate Driving Wheel | Pulse Gen. | ||||
| E8-5 & E8-16 | Ignition On | 9-14 | ||||
| E8-3 & E8-16 | Ignition On | 3 Or Less | ||||
| E10-31 & E8-16 | Ignition On | 9-14 | ||||
| E7-5 & E8-16 | A/C Off | 2 Or Less | ||||
| E7-5 & E8-16 | Engine Idling & A/C Off | 9-14 | ||||
| E7-16 & E8-16 | Engine Idling & A/C On | 2 Or Less | ||||
| E7-16 & E8-16 | Engine Idling & A/C Off | 9-14 | ||||
| E9-2 & E9-16 | Ignition On | 9-14 | ||||
| E9-8 & E9-16 | Ignition On | 3-4 | ||||
| E8-9 & E8-16 | Cooling Fan On High | 9-14 | ||||
| E8-9 & E8-16 | Cooling Fan On Low Or Off | 0-2 | ||||
| E7-13 & E8-16 | Engine Idling | Pulse Gen. | ||||
| E8-8 & E8-16 | Ignition On & Vacuum Hose To Vapor Pressure Sensor Disconnected | 9-14 | ||||
| E8-13 & E8-16 | Ign. On & 0.6 in. Hg (2 kPa) Applied To Vapor Pressure Sensor | 1.3-2.1 | ||||
| E7-8 & E8-16 | (2) During Transmission | Pulse Gen. | ||||
| E7-24 & E8-16 | Ign. On & Brake Pedal Pressed | 7.5-14.0 | ||||
| E7-24 & E8-16 | Ign. On & Brake Pedal Released | 0-1.5 | ||||
| E8-15 & E8-16 | Ignition On | 0.4-1.6 | ||||
| E8-15 & E8-16 | Ign. On & 5.1 in. Hg (17 kPa) Applied To EGR Valve | 3.2-5.1 | ||||
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