Engine Running Self-Test
This test checks sensors under actual operating conditions and at normal operating temperature. The actuators are exercised and checked for corresponding results. Fault must be present at time of test to be detected.
Connect jumper wire or STAR tester to activate test. This test will display an Engine ID code, a Dynamic Response code and an On Demand Service code. After a Dynamic Response code (single digit) is received, quickly press and release accelerator once only.
Deactivate self-test. Start and run engine at more than 2000 RPM for 2 minutes. Turn engine off and wait 10 seconds. Start engine. Test will proceed with Engine ID code, Dynamic Response code and Engine Running On Demand Service codes. If a 10 or 1 pulse occurs during Dynamic Response code, open throttle wide open momentarily. Record codes and proceed as follows:
| On Demand Codes | Proceed to Test | ||
|---|---|---|---|
| 11 | (1) CONTINUOUS TEST | ||
| Any | See Code No. Below | ||
| None | Repeat Self-Test; then Test I | ||
| 12 | Test K | ||
| 21 | Test D | ||
| 22 | Test E | ||
| 23 | Test F | ||
| 24 | Test G | ||
| 31 | Test H | ||
| 32, 33, 34 | Test H, step 9) | ||
| 35 | Test H, step 19) | ||
| 41 | Test J | ||
| 42 | Test J, step 14) | ||
| 43 | Test J, step 26) | ||
| 44, 45, 46 | Test M | ||
| 72 | Test E, step 10) | ||
| 73 | Test F, step 14) | ||
| 77 | Test N | ||
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If a 40-series code appears on vehicles with less than 1000 miles, perform the following: With self-test input grounded, start engine and immediately accelerate to 1750-2500 RPM. Hold throttle in position to maintain this speed for the remainder of the test. DO NOT adjust for speed changes during test. When the Dynamic Response code is received, quickly accelerate engine from elevated RPM and return to idle. DO NOT return to idle without accelerating engine.