Test TC-4A - No Change In Map From Start To Run (DTC 13)

WARNING: This page is about a different car, the 1995 Plymouth Voyager, 1995 Plymouth Grand Voyager, 1995 Dodge Grand Caravan, 1995 Dodge Caravan, and 1995 Chrysler Town & Country. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagrams, see WIRING DIAGRAMS section at the end of this article.

Turn ignition on. Using scan tool, erase DTCs. Start engine. Allow engine to idle for 30 seconds. With engine running, use scan tool to read DTCs. If scan tool does not display NO CHANGE IN MAP FROM START TO RUN, go to step 4).
If scan tool displays NO CHANGE IN MAP FROM START TO RUN, turn ignition off. Disconnect Manifold Absolute Pressure (MAP) sensor connector. Turn ignition on. Using scan tool in voltmeter mode, check voltage on MAP sensor connector 5-volt supply circuit (Violet/White wire).
If voltage is less than 4 volts, repair open or shorted Violet/White wire. Perform TEST VER-2. If voltage is more than 4 volts, remove MAP sensor vacuum hose. Inspect condition of MAP sensor vacuum hose. If MAP sensor vacuum hose is restricted or open, replace vacuum hose as necessary. Perform TEST VER-2. If MAP sensor vacuum hose is okay, replace MAP sensor. Perform TEST VER-2.
Using scan tool, set engine speed to 1500 RPM. With engine running at 1500 RPM, read scan tool MAP sensor voltage. While monitoring MAP sensor voltage, wiggle MAP sensor connector and wiring harness.
If engine stalls or MAP sensor voltage becomes erratic, inspect all related wiring and connectors, and repair as necessary. Perform TEST VER-2. If engine does not stall and MAP sensor voltage does not become erratic, snap throttle open and closed while monitoring scan tool.
If engine vacuum does not rapidly drop to less than one in. Hg, go to step 8). If engine vacuum rapidly drops to less than one in. Hg, condition required to set DTC is not present at this time. Go to next step.
NO CHANGE IN MAP FROM START TO RUN DTC sets if too small a difference is seen between barometric pressure at key on and manifold vacuum after engine start. Possible causes are: restricted or leaking vacuum/pressure hose to MAP sensor, ice in MAP sensor or passage, or MAP sensor failure. Perform TEST VER-2.
Remove and inspect MAP sensor vacuum hose. If vacuum hose is restricted or open, replace vacuum hose as necessary. Perform TEST VER-2. If vacuum hose is okay, replace MAP sensor. Perform TEST VER-2.