STEP 1. Using scan tool MB991958, check the evaporative emission system monitor test.
| caution | - To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
- During this test, the ECM will automatically increase the engine speed to 1,600 r/min or greater. Check that the transaxle is set to "P" position.
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(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Erase the DTCs using scan tool MB991958.
(4) Check that the fuel cap is securely closed (Tighten until three clicks are heard).
(5) Start the engine.
(6) Select "Special Function".
(7) Select "Evap Leak Monitor".
(8) During this test, keep the accelerator pedal at the idle position.
(9) Keep the engine speed and engine load within the specified range. When the monitor test starts, the "In Progress" item on scan tool MB991958 will change from "NO" to "YES".
(10) Turn the ignition switch to the "LOCK" (OFF) position.
Is "Evap Leak was detected." displayed on scan tool MB991958?
A malfunction has been detected during the monitor test. Refer to the Diagnostic Trouble Code Chart and diagnose any other DTCs that are set 
. If no other DTC's have been set, go to Step 2.
<"Evap Leak Monitor test passed" is displayed on scan tool MB991958.> :
The evaporative emission system is working properly at this time. Explain to the customer that an improperly tightened fuel cap can cause the MIL to illuminate. Return the vehicle to the customer. <"Evap Leak Monitor discontinued. Once turn the IG off then retest again from the beginning." is displayed on scan tool MB991958.> :
The EVAP monitor has been interrupted during the test. Turn the ignition switch to the "LOCK" (OFF) position once, and repeat the monitoring from (1).![[Previous]](../../../buttons/fprev.png)
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