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 | ||||
|---|---|---|---|---|---|---|
| E10-14 & E9-16 | Always | 9-14 | ||||
| E10-23 & E9-16 | Ignition On | 9-14 | ||||
| E8-1 & E8-22 | Ignition On | 4-6 | ||||
| E7-32 & E8-22 | Ignition On, Throttle Fully Open | 9-14 | ||||
| E7-32 & E8-22 | Ignition On, Throttle Fully Closed | 3 Or Less | ||||
| E10-7 & E8-22 | Ignition On, Throttle Fully Open | 3.2-4.9 | ||||
| E10-7 & E8-22 | Ign. On, Throttle Fully Closed | 0.3-0.8 | ||||
| E8-8 & E9-7 | Ignition On | 1.1-1.5 | ||||
| E8-21 & E8-22 | Engine Idling, Intake Air Temp 68°F (20°C) | 1-3 | ||||
| E8-20 & E8-22 | Engine Idling, Coolant Temperature 176°F (80°C) | 0.2-1 | ||||
| E7-13 & E9-16 | Engine Cranking | 6 Or More | ||||
| E7-10 & E7-34 | Engine Idling | Pulse Gen. | ||||
| E7-9 & E7-34 | Engine Idling | Pulse Gen. | ||||
| E7-8 & E7-34 | Engine Idling | Pulse Gen. | ||||
| E7-7 & E7-34 | Engine Idling | Pulse Gen. | ||||
| E7-6 & E7-34 | Engine Idling | Pulse Gen. | ||||
| E7-5 & E7-34 | Engine Idling | Pulse Gen. | ||||
| E7-10 & E7-34 | Ignition On | 9-14 | ||||
| E7-9 & E7-34 | Ignition On | 9-14 | ||||
| E7-8 & E7-34 | Ignition On | 9-14 | ||||
| E7-7 & E7-34 | Ignition On | 9-14 | ||||
| E7-6 & E7-34 | Ignition On | 9-14 | ||||
| E7-5 & E7-34 | Ignition On | 9-14 | ||||
| E7-24 & E9-16 | Engine Idling | Pulse Gen. | ||||
| E7-16 & E9-16 | Ignition On | 1 Or Less | ||||
| E7-15 & E9-16 | Engine Idling | Pulse Gen. | ||||
| E7-26 & E9-16 | Engine Idling | Pulse Gen. | ||||
| E7-30 & E9-16 | Engine Idling | Pulse Gen. | ||||
| E7-29 & E9-16 | Engine Idling | Pulse Gen. | ||||
| E7-12 & E9-16 | Ignition On | 4.5-5.5 | ||||
| E7-12 & E9-16 | Engine Idling | Pulse Gen. | ||||
| E9-14 & E8-22 | Engine On | 4.5-5.5 | ||||
| E8-18 & E9-16 | Engine Idling | 0-3 | ||||
| E8-18 & E9-16 | Ignition On | 9-14 | ||||
| E10-28 & E9-16 | During Transmission | Pulse Gen. | ||||
| E10-13 & E9-16 | Engine Idling | Pulse Gen. | ||||
| E8-16 & E8-17 | Engine Idling | Pulse Gen. | ||||
| E8-5 & E8-6 | Engine Idling | Pulse Gen. | ||||
| E7-25 & E9-16 | High Temperature Restart | 3 Or Less | ||||
| E7-25 & E9-16 | Ignition On | 9-14 | ||||
| E10-21 & E9-16 | Defogger & Taillight On | 7.5-14 | ||||
| E10-21 & E9-16 | Defogger & Taillight Off | 0-1.5 | ||||
| E9-12 & E9-16 | Ignition On | 9-14 | ||||
| E9-6 & E9-16 | Ignition On | 9-14 | ||||
| E7-22 & E9-16 | Ignition On Disconnect E7 Connector | 9-14 | ||||
| E7-23 & E9-16 | Ignition On Disconnect E7 Connector | 9-14 | ||||
| E9-1 & E9-16 | Engine Idling, A/C On | 3 Or Less | ||||
| E9-1 & E9-16 | Engine Idling, A/C Off | 9-14 | ||||
| E8-13 & E9-16 | Maintain 2500 RPM 2 Minutes With Engine Warm, Then Idle | 1-4 | ||||
| E8-19 & E9-16 | Maintain 2500 RPM 2 Minutes With Engine Warm, Then Idle | 1-4 | ||||
| E9-10 & E7-28 | Idling | 3 Or Less | ||||
| E9-10 & E7-28 | Ignition On | 9-14 | ||||
| E9-11 & E7-28 | Idling | 3 Or Less | ||||
| E9-11 & E7-28 | Ignition On | 9-14 | ||||
| E10-25 & E7-28 | Idling | 3 Or Less | ||||
| E10-25 & E7-28 | Ignition On | 9-14 | ||||
| E8-15 & E7-28 | Idling | Pulse Gen. | ||||
| E8-14 & E9-16 | Ignition On | Pulse Gen. | ||||
| E7-14 & E9-16 | Ignition On, Gearshift Not in "P" Or "N" | 9-14 | ||||
| E7-14 & E9-16 | Ignition On, Gearshift "P" Or "N" | 3 Or Less | ||||
| E10-12 & E9-16 | Ignition On, Rotate Driving Wheel | Pulse Gen. | ||||
| E9-5 & E9-16 | Ignition On | 4.5-5.5 | ||||
| E10-7 & E9-16 | Ignition On | 4.5-5.5 | ||||
| E10-5 & E9-16 | Engine Idling, A/C On | 2 Or Less | ||||
| E10-5 & E9-16 | Engine Idling, A/C Off | 9-14 | ||||
| E10-20 & E9-16 | Engine Idling, A/C On | 9-14 | ||||
| E10-20 & E9-16 | Engine Idling, A/C Off | 2 Or Less | ||||
| E9-2 & E9-16(2) | Ignition On | 9-14 | ||||
| E10-9 & E9-16 | Cooling Fan On High | 9-14 | ||||
| E10-9 & E9-16 | Cooling Fan On Low Or Off | 0-2 | ||||
| E9-3 & E9-16 | Engine Idling | 9-14 | ||||
| E9-3 & E9-16 | Ignigion On | 3 Or Less | ||||
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