Ah Haaaaaaaa ! ! !
I was doing some research on the MAP sensor problems and codes.
No where does it say ANYTHING about the mysterious code *16* I was pulling.
I came across a trouble and repair article on a auto zone web page and it told
me how to test the MAP sensor.
When testing the supply voltage at the MAP sensor terminal C, the voltage should
be 4.5-5.5 volts. At terminal 16 of the ECU wire harness connector the corresponding
wire harness terminal is #16 There is the code 16.
I'm guessing the wiring harness is going bad or a lead is loose.
Test the MAP sensor output voltage at the MAP sensor connector terminal B for 4-5 volts.
If you notice it's also telling you to test the output voltage at terminal #33 for the supply
voltage to the MAP sensor.
***(code 33)***
M.A.P. SENSOR
The MAP sensor is attached to the plenum chamber near the hood latch.
It reacts to absolute pressure in the intake manifold and provides an input
voltage to the ECU. Manifold pressure is used to supply mixture density
information and ambient barometric pressure information that is necessary
for computing the air/fuel mixture. A vacuum line from the throttle body
attaches to the MAP sensor to provide its input pressure. A Manifold Air
Temperature (MAT) sensor is located in the intake manifold and measures
the air/fuel mixture temperature to allow the ECU to compensate for air
density changes during high temperature operation.
TESTING
MAP sensor connector terminals
Inspect the MAP sensor vacuum hose connections at the throttle body and
sensor and repair as necessary.
Test the MAP sensor output voltage at the MAP sensor connector terminal B
as marked on the sensor body, with the ignition switch ON (engine OFF). The
output voltage should be 4-5 volts.
Test ECU terminal 33 for the same voltage described above to verify the wire
harness condition. Repair as necessary.
Test the MAP sensor supply voltage at the sensor connector terminal C with
the ignition ON. It should be 4.5-5.5 volts. This voltage should also be at terminal
16 of the ECU wire harness connector. Repair or replace the wire harness as necessary.
Test the ECU with Diagnostic Tester MS 1700, if necessary.
Test the MAP sensor ground circuit at sensor connector terminal A and ECU connector
terminal 17. Repair the wire harness, if necessary.
Test the MAP sensor ground circuit at the ECU connector between terminal 17 and
terminal 2 with an ohmmeter. If the ohmmeter indicates an open circuit, inspect for
a defective sensor ground connection on the flywheel/drive plate housing near the
starter motor. If the ground connection is good, replace the ECU. If terminal 17 has
a short circuit to 12 volts, correct this condition before replacing the ECU.
