Engine Data Display Procedure

Enter diagnostics and with code "70" displayed, slide cruise instrument panel switch off. Code "90" should appear. If code "90" does not appear, refer to switch test code "75".
NOTE: To advance to code "90" on vehicles without cruise control, momentarily jumper Yellow wire (Pin C, Circuit No. 904) and Lt. Blue/Black wire (Pin D, Circuit No. 903) in 6-wire cruise control instrument panel switch connector. Connector is located on left side of steering column under instrument panel.
Engine data display shows values of 11 parameters monitored by ECM. Parameter numbers (01-11) will be displayed for 1 second on ECC panel, followed by a 1-digit or 2-digit value. The parameter value will be displayed for 5 seconds. Each parameter and value will be repeated until manually advanced to next parameter.
To advance display, depress "INSTANT/AVG" button on MPG panel. To return to previously displayed parameter, depress "MPG RESET" button. After last parameter is displayed, code "95" should appear. To clear engine data display at anytime, depress "OFF" and "HI" buttons on ECC panel at the same time. Code "70" should appear.

Engine data display information can be used to compare information of engine to that of properly functioning engine for diagnosis of malfunctions. Parameters read and values displayed are as follows:

01 - Throttle angle displayed in degrees (2 digits).
02 - MAP value displayed as number between 1 and 99. Reading above 100 will appear as 99.
03 - BARO value displayed in same manner as MAP value.
04 - Coolant temperature displayed as number between 0 and 99. See conversion chart.
05 - Manifold air temperature displayed in same manner as coolant temperature.
06 - Injector pulse width is displayed in milliseconds. Decimal point will not appear and MUST be assumed between 2 digits. (32 means 3.2 milliseconds).
07 - Oxygen sensor voltage is displayed in volts. Decimal point will not appear and MUST be assumed before 2 digits. (60 means 0.60 volts).
08 - Spark advance value displayed in degrees (2 digits).
09 - Ignition cycle value is number of times ignition has been cycled since trouble code was stored.
10 - Open/Closed loop indicator displays which mode ECM is operating the system. Open loop is indicated by "0" and closed loop is indicated by "1".

11 - Battery voltage is displayed in volts. Decimal point and 10's will not appear and MUST be assumed. (23 means 12.3 volts).

COOLANT TEMPERATURE CONVERSION CHART

Code	Degrees F
0	-40
8	-12
12	+1
16	15
21	32
25	46
30	64
35	81
40	98
45	115
50	133
52	140
54	147
56	153
58	160
60	167
62	174
64	181
66	188
68	195
70	202
72	209
73	212
75	219
80	236
85	254
90	271
99	302

Code	Degrees F
0	-40
8	-12
12	+1
16	15
21	32
25	46
30	64
35	81
40	98
45	115
50	133
52	140
54	147
56	153
58	160
60	167
62	174
64	181
66	188
68	195
70	202
72	209
73	212
75	219
80	236
85	254
90	271
99	302

Code	Degrees F
0	-40
8	-12
12	+1
16	15
21	32
25	46
30	64
35	81
40	98
45	115
50	133
52	140
54	147
56	153
58	160
60	167
62	174
64	181
66	188
68	195
70	202
72	209
73	212
75	219
80	236
85	254
90	271
99	302

Code	Degrees F
0	-40
8	-12
12	+1
16	15
21	32
25	46
30	64
35	81
40	98
45	115
50	133
52	140
54	147
56	153
58	160
60	167
62	174
64	181
66	188
68	195
70	202
72	209
73	212
75	219
80	236
85	254
90	271
99	302