Test Sequence I

With vehicle prepared as specified, place switch in "Vref" (reference voltage) position. Note voltage reading.
Reading should be 8.5-9.5 volts. If not, perform REFERENCE VOLTAGE (VREF) NOT WITHIN LIMITS procedure. See COMPONENT DIAGNOSIS in this article.

NOTE: If reference voltage limits are incorrect, the REFERENCE VOLTAGE (VREF) NOT WITHIN LIMITS procedure must be performed and limits corrected before proceeding with remainder of TEST SEQUENCE I.
Set switch to "MAP" position. Note voltage reading. Reading should be within limits shown in VOLTAGE LIMIT/ALTITUDE VARIATION table. If not, complete test sequence before performing COMPONENT DIAGNOSIS testing and repairs.
Set switch to "TP". Note voltage reading. Reading should be 1.65-2.14 volts. If not, complete test sequence before performing COMPONENT DIAGNOSIS testing and repairs.

Set switch to "BP". Note voltage reading. Reading should be within limits shown in VOLTAGE LIMIT/ALTITUDE VARIATION table. If not, complete test sequence before performing COMPONENT DIAGNOSIS testing and repairs.

VOLTAGE LIMIT/ALTITUDE VARIATION

Elevation (Feet)	MAP & BP Limits (Volts)
0-1000	6.7-7.8
1000-2000	6.5-7.4
2000-3000	6.2-7.3
3000-4000	6.0-7.0
4000-5000	5.8-6.8
5000-6000	5.5-6.6
6000-7000	5.3-6.4

Set switch to "ECT". Note voltage reading. Reading should be 1.9-3.7 volts. If not, complete test sequence before performing COMPONENT DIAGNOSIS testing and repairs.
Set switch to "IAT". Note voltage reading. Reading should be 4.1-6.3 volts. If not, complete test sequence before performing COMPONENT DIAGNOSIS testing and repairs.
Set switch to "TAB". Note voltage reading. Reading should be greater than 10.5 volts. If not, complete test sequence before performing COMPONENT DIAGNOSIS testing and repairs.
Set switch to "EVP". Note voltage reading. Reading should be 1.09-1.61 volts. If not, complete test sequence (I and II) before performing COMPONENT DIAGNOSIS testing and repairs.
NOTE: After completing "Test Sequence I", go to "TEST SEQUENCE II " and complete sequence before attempting repairs on sensors/circuit which did not meet specifications (except as noted).

TEST SEQUENCE I & II SENSOR SPECIFICATIONS

Sensor/Circuit Being Checked

Test Fixture Being Used System Operating Volt/Ohms Specs.

Crankshaft Position

Blue

100-250 Ohms

Ignition Module

Black

7-13 Ohms

Reference Voltage (Vref)

.....

8.5-9.5 Volts

Crank Signal

.....

5 Volts

Manifold Absolute Pressure

Test Sequence I

.....

⁽¹⁾

Test Sequence II

Yellow

3.5-5.5 Volts

Throttle Position

.....

1.65-2.14 Volts

Barometric Pressure

Test Sequence I

...

⁽¹⁾

Engine Coolant Temp

......

1.9-3.7 Volts

Inlet Air Temperature

Test Sequence I

.....

4.1-6.3 Volts

Test Sequence II

Brown

5.2-7.2 Volts

TAB Solenoid

.....

At Least 10.5 Volts

EGR Valve Position

.....

1.09-1.61 Volts

⁽¹⁾	See VOLTAGE LIMIT/ALTITUDE VARIATION table for specifications.