Output Cycling Tests Procedure

Enter diagnostics and with code "70" displayed on ECC panel, depress "Instant/Average" button on MPG panel. Code "95" should appear. If code "95" does not appear, refer to switch test code "78". Depress "Instant/Average" button while parameter "11" of Engine Data Display appears.
Output cycling tests consist of 2 operations: Actuator cycling test and cylinder select test. Actuator cycling test turns ECM's outputs on and off with engine off. Cylinder select test operates modulated displacement solenoids with engine running.
To enter actuator cycling tests, start engine. Turn engine off and within 2 seconds, turn ignition on. Enter diagnostics and display code "95" on ECC panel. Depress accelerator pedal to wide open throttle position and release pedal. Code "96" should appear.
Turn cruise instrument panel switch on. Output cycling tests will cycle Group A outputs on and off for 3 seconds and then cycle Group B outputs on and off for 3 seconds. Group A outputs consist of coolant light, cruise power valve, cruise vacuum valve, air switching valve and ISC extend. Group B outputs consist of cruise "On/Off" switch, canister purge solenoid, EGR valve solenoid, air divert valve and ISC retract.
Cycling test will alternate between Group A and Group B outputs and automatically shut off after 1 minute. Cruise power valve operates continuously. After cycling output is complete, display should switch from code "96" back to code "95".
To enter cylinder select tests, start engine. With engine running, enter diagnostics and display code "95". Depress accelerator pedal to wide open throttle position and release. Code "97" should appear on ECC panel.

With code "97" displayed, ECM will control modulated displacement automatically. Depressing "Instant/Average" button on MPG panel will force engine to operate in 8-cylinder mode as long as button is depressed. Depressing "Reset" button on MPG panel will force engine to operate in 6-cylinder mode as long as button is depressed. Depressing "Active Cylinder" button will force engine to operate in 4-cylinder mode as long as button is depressed.

TROUBLE CODE CHART REFERENCE

Code	Problem Area
12	No tach signal to ECM.
13*	Oxygen sensor not ready.
14	Shorted coolant sensor circuit.
15	Open coolant sensor circuit.
16	Generator output voltage out of range.
17	Crank signal circuit high.
18	Open crank signal circuit.
19	Fuel pump circuit high.
20	Open fuel pump circuit (2 charts).
21	Shorted TPS circuit.
22	Open TPS circuit.
23	EST/By-pass circuit.
24	Speed sensor failure.
26	Shorted throttle switch circuit.
27	Open throttle switch circuit.
30	ISC circuit.
31	Shorted MAP sensor circuit.
32	Open MAP sensor circuit.
33	MAP/BARO sensor circuit.
Intermittent	33 MAP/BARO sensor correlation.
34	MAP sensor circuit.
35	Shorted BARO sensor circuit.
36	Open BARO sensor circuit.
37	Shorted MAT sensor circuit.
38	Open MAT sensor circuit.
44*	Oxygen sensor lean.
45*	Oxygen sensor rich.
60	Drive (ADL) switch circuit.
61 & 68	"Set/Coast" and "Resume/Accelerate" circuit.
63	Car and set speed tolerance exceeded.
71	Brake release switch circuit.
72	ISC throttle switch circuit.
73	Drive (ADL) switch circuit.
74	Back-up light switch circuit.
75	Cruise control on/off circuit.
76	Cruise control "Set/Coast" switch circuit.
77	Cruise control "Resume/Accelerate" circuit.
78	MPG "Average" circuit.
79	MPG "Reset" circuit.
80	Air conditioning clutch circuit.
Trouble codes marked with an apply to "Hard Failures" and "Intermittent Failures".

Cylinder select test will automatically shut off after 1 minute of operation. To deactivate cylinder select test prior to automatic shut off, depress "Instant/Average" button. Code "95" should appear on display panel.